Okay guys as the old guide was missing some information/outdated, I thought it might be a good idea to redo and update the bones to experience guide for anyone looking to calculate their prayer costs.
So there is 2 main places you can do this:
 

The First being in wild resource area at lvl 54, found under the skilling teleport tab, has a Chaos alter to lay bones on, boasting the same experience as the one in the donator zone and inevitably the best prayer experience for the small risk you take.
 
Experience / Bones to 99:
Bones - 696xp / 18,727 Bones,
Big Bones - 1,479xp / 8,814 Bones,
Dragon/Wyvern Bones - 7,308xp / 1,784 Bones,
Fayrg Bones - 8,526xp / 1,529 Bones,
Dagganoth Bones - 12,615xp / 1,033 Bones,
Lava Dragon Bones - 14,181xp / 920 Bones,
Zogre/Ourg Bones - 37,845xp / 344 Bones,
Superior Dragon Bones - 43,326xp / 301 Bones,
Long Bones/Curved Bones - 60,900xp / 215 Bones.
 

The second being the Magical alter at home, located just North of the Bank, for those not wanting to take any risk whilst training Prayer, however at a reduced experience rate.
 
Experience / Bones to 99:
Bones - 464xp / 28,092 Bones,
Big Bones - 986xp / 13,220 Bones,
Dragon/Wyvern Bones - 4,872xp / 2,676 Bones,
Fayrg Bones - 5,684xp / 2,294 Bones,
Dagganoth Bones - 8,410xp / 1,550 Bones,
Lava Dragon Bones - 9,454xp / 1,379 Bones,
Zogre/Ourg Bones - 25,230xp / 517 Bones,
Superior Dragon Bones - 28,884xp / 452 Bones,
Long Bones/Curved Bones - 40,600xp / 322 Bones.
 
So just to conclude, as you can see for yourself, it is a considerable amount faster to finish this task up at the wild Chaos alter! For the small risk you take (considering there is a bank in the area), is safe to say it's worth the time and money saved for an easy 99.
Hope this guide helps those looking to reach their goal off 99 Prayer!
Peace,
D

First of all, I would like to apologize from every member of GrinderScape for the delayed updates. Unfortunately, Christmas and New Year's Eve came together where all the other developers and I got busy. The good news we are back and fully prepared to bring some new exciting content and make GrinderScape great again!
 
Bugs and Fixes:
- Added black (g) robes and black (t) to the miscellaneous thieving stall.
- Fixed boss contract task cancellation to work properly.
- Removed crystal and muddy keys drop from several low-level NPC's.
- Fixed slayer task rewards for slayer helmets.
- Fixed double money reward for stalls bug.
- Massively buffed casket rewards. (Elite gives better rewards)

- Updated in-game rules. Quest tab 'rules' now shows the full forum rules page.

- Fixed wilderness area north of black knight area.
- Fixed slayer task checking and assigning system.


- Added skilling task in quest tab which now shows what skilling task you have.



 
- Extended double cash weekend system duration.
- Nerfed dragon claws by 15%.
- Fixed a bug where your tab interface would disappear because of your resizable mode settings.
- Resizable mode default window size changed to match fixed mode default window size.
- Changed resizable mode transparent chatbox to look like OSRS's.
- Changed transparent scroll bars to look like OSRS's.
- Changed minimum scroll bar's bar height from 8 to 10 to be accurate to OSRS.
- Fixed skilling interface client freeze bug.
- Minimap hovers are now be disabled if hovering over the tab area (for example in the resizable mode with side stones stacked and a tab open, you will not be able to hover over or click the notifications button anymore).
- Minimap walk to clicks is now disabled if hovering over the world map or notifications buttons.
- Ring of life handling is redone, fixes any of its previous version's bugs. NOTE: works at and below level 20 wilderness, in the future this may be changed to 30 to be accurate to OSRS, left it at 20 currently as we have not added support for other OSRS up to level 30 wilderness teleports yet (like the amulet of eternal glory).
- Event rewards are now sent to the bank unnoted.
- Emojis button now is the correct color when in resizable mode and using opaque chat box.
- Various different iron man gear equipment types fixed.
- Login interface now does not show up when logging into the wilderness.
- Fixed makeover mage and equipment screen interfaces' character models being invisible.
- Boss contract rewards have been doubled, and the timings have been increased based on the boss difficulty.
- Corporeal critter pet is now supported.
- Fixed equipment issue with Elder chaos helmet.
- Yell Customizer now works with spaces in your yell title.

- Fixed crowns in Yell Customizer preview.
- Fixed remember username/password buttons on the login screen.
Content:
- Full support for Amulet of Damned:

*  Dharok the Wretched's equipment - Players wearing Dharok's set will have a 25% chance of recoiling 15% of the damage taken. This effect can stack with the Vengeance spell and a ring of recoil to recoil 100% of the damage taken.
*  Players wearing Verac's set will have an additional +4 Prayer bonus (not counting the amulet's +3).
*  Torag the Corrupted's equipment - Players wearing Torag's set will have their Defence increased by 1% for everyone health missing.
*  Guthan the Infested's equipment - Players wearing Guthan's set will be able to heal ten hitpoints above their base Hitpoints level.
*  Players wearing Karil's set will have a 25% chance of dealing two hitsplats. The second hitsplat will deal half the damage of the first hitsplat.
*  Players wearing Ahrim's set will be able to autocast Ancient Magicks. In addition, players will have a 25% chance of dealing a hit with 30% increased damage.
- Game Mode Setup: (Coming soon)


- Auto Dicing System: (Coming soon)

- Player Titles System: (Coming soon)

 
- Corp Pet Added:
* Full functional pet.
* Full dialogue system.



 

Personally, I enjoy my Anti-Santa with Anti-Treats Sack for the adults, however, I decided to go with my OG set. 
Includes: Hornwood Helm, Amulet of Magic (t), Mythical Cape, Saradomin Godsword, Ancestral Robe Top, Ancestral Robe Bottom, Cooking Gauntlets, Eternal Boots, and just for my own pleasure, Ring of the Gods. 
Video: https://imgur.com/a/H32wg4q

Donator rank information
 
What Is Donator?
Donator status is given to a player in game when he/she donates. GrinderScape really appreciates the support of the server, so they try to provide special qualities to the players (while keeping it fair to all-meaning it is not required to donate).
 

Premium point items information
 
Skilling tomes
Fishing tome - A tome of learning that focuses on Fishing skill by rewarding 10M experience. Agility tome - A tome of learning that focuses on Agility skill by rewarding 10M experience. Mining tome - A tome of learning that focuses on Mining skill by rewarding 10M experience. Firemaking tome - A tome of learning that focuses on Firemaking skill by rewarding 10M experience. Woodcutting tome - A tome of learning that focuses on Woodcutting skill by rewarding 10M experience. Thieving tome - A tome of learning that focuses on Thieving skill by rewarding 10M experience. Skilling Supplies
A box that contains the following skilling supplies.

Mystery box
A box that contains alot of items which item u get is completly random.
Loot from 100 mystery boxes: 

 
Other rewards
 
Crystal keys
The loop half of a key is used with a tooth half of a key to make a crystal key.
A crystal key van be used on the crystal chest in Edgeville.

 
Loot of 100 crystal keys:
 

 
 
Muddy keys
A muddy key can be used on the closed chest in the centre of the lava maza (Wildy level 43) to obtain random loot.
 

 
Loot out of 100 Muddy Keys:
 

 
 
 
I hope this information was usefull. If you still have any questions feel free to PM me or another staff member.

Bugs and Fixes:
- Fixed two similar items in vote shop.
- Magic skill guide level display fix.
- Added high scores menu at the navigation bar on forums.
- High scores button is now available in the quest tab.
- Fixed double voting points message when redeeming.
- Lottery maximum money cap increased from 50M to 2 billion GP coins.
- New items prices in the price checker fixed. eg (Dragon whip, Avernic defender..etc)
- Updated client's icon to the new dragon whip.
- Fixed dragon med helmet equip appearance with hairstyles.
- Thieving from stalls is 1.3x faster (You can mass click the miscellaneous stall)
- Thieving stalls reward 60% extra GP money now, and the double on weekends.
- Donators get 25% extra cash reward when thieving from stalls.
- Coins drops from NPC's is now doubled.
- Thieving messages are often sent to you when you are thieving from stalls.


- Skilling tasks cash reward is increased by up to 60-80%.
- Removed the gate which prevented players from entering wilderness agility course.
- Removed some boss announcements on death which aren't considered bosses.
- Skillcape store stock amounts now reflect their prices.
- Deactivating or activating a prayer will now close interface if one is open.
- Upgraded lava staves now work properly.
- Bones added to bottom of player death loot pile.
- Looting bag and rune pouch will now drop their contents on death.
- Financial advisor now has the correct dialogue.
- Typo "have" changed to "has" in many places (notably announcement chat messages).
- Correct equipment types added to Armadyl chest plate, looting bag, rune pouch, all armor sets.
- Fixes clipping problems or being able to equip an item that shouldn't be able to be equipped.
- Correct requirements added to Armadyl helmet, Armadyl chest plate, Armadyl chain skirt.
- Total value calculating of an item container adjusted to account for overflow.
- Bolt enchanting interface items no longer swap-able.
- Teleport interface button hovering fixed.
- Item sprite's brightness now will change when using the brightness slider.
- "<" can now be typed in inputs including chatbox message input.
- "Username has logged in." messages will now appear in the same places private messages do.
- Adjustments made to game screen drawing to be cleaner and prevent login screen freezes, however please let us know if login screen freezes still occur as they did not occur during testing after the changes were made.
- Chat menu actions will no longer display when bank searching, or shop searching.
- Interface menu offsets adjusted left 1px and up 2px to be 100% accurate in fixed mode.
- Autocast on top toggle adjusted to move autocast option to top instead of replacing the cast option, which fixes a bug where you could not alch while the toggle was enabled.
- Hunter traps area cleared.
- Sandwich lady random event fixed.
- Text shadow added to yell chat messages to make them easier to read.
- Fixed ::thread command.
 
Content:
- High scores feature added on the website:
* Added account ID manager.
* Passive database worker for smooth & efficient database handling.
* More logged stuff that will be available for staff (back-end management).
* Added fail-safe for the query just in case database gets offline.

- Clan chat overhaul:
* Fixed accidental extra space before clan rank icons in clan chat messages.
* Banning a member will now always kick them even when banning using the button in the clan chat setup interface.
* Adding names to the clan chat setup ranked members list will no longer accept duplicate names.
* Adding names to the clan chat setup banned members list will no longer allow duplicate names.
* Clan chat setup ranked members list will no longer contain names of players that have no rank.
* Clan chat kick message altered to be more accurate to OSRS.
* Staff rank icons will now appear next to staff names in clan chat messages.
* When creating a clan chat, you will now automatically join that clan chat, and your clan chat setup interface will be refreshed if open.
* Clan chat setup member list scrollbars will now reflect the number of members in each list.
* Added Kick, Demote, and Ban actions to clan chat tab member actions.
* Promote to Owner action removed from clan chat setup member actions.
* Clan chat tab title now displays the number of members in the clan chat.

- Items kept on death interface:
* Complete new interface matching OSRS style 100%.
* Supports more than 4 items to be kept on death.

- Decanter System implemented:
* Added decanter NPC at Edgeville.
* Fully supports all types of potions decanting.
* Full dialogue system rework.

- Price checker overhaul:
* Heavily refreshed to match OSRS style.
* Search for item functionality added. (Temporarily disabled for testing).
* Insert all items button.
* Withdraw all items button.
* All buttons with their proper hovers.
* Items are sorting properly.


- New Skins Available:
* 9 new colored skins to choose from.


- XP drops system:
* Redone to be more efficient and handle any amount of queued drops.
* XP drops aesthetically redone in some ways to make skill icon alignment more accurate to OSRS.
* Skill orbs will now display on top of combat box and XP drops.
* Skill orbs/combat box/XP drops will now move depending on which are being shown to prevent overlaying on top of each other.


- Call follower button added to the equipment tab.

- Hitpoints XP will now be added after other combat XP rather than before.
- A way for sending player dialogues based on their selected option in a dialogue has been added which will make creating more OSRS accurate dialogues in the future much more manageable.
- Misc dialogues slightly changed to be more grammatically correct, easier to understand, consistent with other dialogues, or accurate to OSRS.
- Shopkeeper/assistants talk-to dialogue added.
- New shop interface:
* Completely new interface which allows more items to be placed.
* Search functionality system improved and now shows text if no matches are found.
* Ability to toggle from the server to preview old or new interface.

- Spells and spell hovers will now account for runes in your rune pouch.
- Spells and spell hovers will now consider for new staves (e.g., new lav -Private chat message spacing and color adjusted to be more accurate to OSRS).
- All scrollbars now do not disappear when scrollbar height is too low like OSRS.
- Shop menu actions updated to be more accurate to OSRS, including new Buy/Sell 50 action.
- New Equipments Tab & Stats Calculation made more efficient with decimal checkings.


- Emojis system:
* A whole new set of emojis is now available.
* Complete new interface and handling system support.
* Line divider above the chat box message input has been adjusted to be behind the chat box message input to allow for emojis to overlay over the divider.
* You can now add an emoji to your chat by typing its corresponding text.
* Supports resizeable and all screens modes.


 
 
If you would like to see a video of the update and support our channel: (Don't brute-force my pass :P)
 

Bugs and Fixes:
- Tabs used to disappear even when the player was not able to teleport.
- Revenant caves pillars far distance teleportation fixed.
- Added the new Emblem trader in the wilderness who trades artifacts dropped by revenants.
- Valuing abyssal bludgeon and some items closes the interface.
- Ice/Smoke/Blood barrage combat bug fixed.
- Unequipping some items now works properly again.
- Hunter bug mass clicking fixed.
- Clue scroll equipment bug fixed.
- Selling artifacts is now only available in the revenant's cave.
- Fixed agility obstacles XP bug.
- Removed godsword making permanent message.
- Fixed auto casting with air staff.
- Fixed agility skillcape equipment requirements.
- Fixed Kree'arra not spawning.
- Fixed torn robe equip bug.
 
P.S: This is a mini update to support the upcoming one.

Although I did my best to test everything fully, if you find any bugs be sure to report them and I will get them fixed!

Bugs and Fixes:
- Revenant ether is now tradeable.
- Items that used to bug out while being in the noted shape no longer happens.
- Changes to overlayItemIcon to fully support placeholders.
- Can now rearrange placeholders.
- The old version of the spacebar to continue dialogue removed.
- All banking withdraw actions except withdraw-1 do not trigger atInventoryInterface anymore to match OSRS.
- Timer buttons (bank deposit buttons) now will support any button with a timerSpeed instead of just those two buttons.
- A new version of the spacebar to continue dialogue added.
- 1, 2, 3, 4, 5 keys to select dialogue added.
- Added login error messages for when username or password is empty to match OSRS.
- Added setting text input to the login input when those login errors occur to match OSRS.
- Minimap marking adjusted to rotate properly in resizable mode.
- Minimap marking safe region in resizable mode adjusted to prevent marks from extending outside the minimap border.
- Compass rotating adjusted to rotate properly in resizable mode.
- Enter to skip login screen added to match OSRS.
- Fixed a bug where clicking the 'New User' button on the login screen in the same region that the 'Cancel' button is would click both.
- Adjusted clan chat message sending to match OSRS.
- Added tab buttons' remove placeholders action.
- Added release all placeholders button.
- Removed sorting of items when checking if a bank container is empty.
- Fixed bug where the main tab could be empty when the bank is not.
- Added support for switching placeholders to containers (e.g. creating a bank tab using a placeholder).
- Tab collapsing made more efficient.
- Weapon minigame is now fixed and playable.
- Fixed edge wilderness now showing upon entry.
- Shorter get time elapsed in quest tab to show properly.
- Join date now shows in dd/mm/yyyy date format.
- Keybindings bug fixes & savings.
- Mystery box appearing in ancient magic spellbook bug fixed.
- A small fix for action delays is now more efficient.
 
Content:
- New bank system: (Thanks to Xplicit)
* Tab buttons work just like OSRS.
* Tab rearranging just like OSRS, designed to work with any sprite so supports digits/roman numerals setting.
* Can swap/insert/drag items into different tabs from inside the main tab.
* Item dragging all handled where it normally is for a container, no drawing of it over the interface, also item drag scrolling works like OSRS where it doesn't scroll if in the bank tabs area and a delay for activating scrolling up to prevent any jittering when dragging an item to the bank tabs area.
* Any empty slots at the beginning of a tab get sorted out.
* Tab collapsing/collapse all tabs.
* Menu options same as OSRS, with a custom last x value that is saved server-side.
* Wear/Wield option added to inventory items (only gets added to items with that option in their itemdef actions), can shift-click to wear/wield (might change this to control in case it is confusing with shift-click dropping).
* 100% Client sided searching, can swap/insert/drag items into different tabs while searching.
* Bank settings menu (only has the tab display options for now), uses the same interface.
* Height of bank adjusts in resizable.
* Most interface components look as they do on OSRS.






- Added support for 2 new types of automatic backgrounds (pre eoc styles).
- Quest tab revamp:
* Achievements overhaul.
* Achievements now show in proper order.
* Redone the whole quest tab system and buttons to be much smoother.
* Quest tab interface handling.
* Tab scrolling handling system.


- Shop searching feature:
* Can be removed/added for any of our game shops.
* Allows the player to quickly search for the item looking for.


 
Enjoy!

Awesome job, brother! Making Grinderscape great again, one update at a time.