Players cannot receive Slayer assignments for warped tortoises unless they have completed the quest. They are commonly killed for the frequent drop rate of tortoise shells, used for creating a war tortoise pouch. They are also killed for their frequent drop of rune warhammers and pickaxes. Their horrific appearance is a result of tampering with the Anima Mundi during experiments conducted by Glouphrie in Arposandra. The experiments have caused the tortoises to grow an additional pair of legs, as well as a group of purple tentacles protruding from their shell.
Warped tortoises are completely immune to any attack, unless players have a crystal chime in their inventory or on their tool belt. They mainly attack with magic, which can deal moderate damage. They are weak against ranged, particularly crossbows. A dragon crossbow or better is sufficient. There are relatively few areas where these foes may be killed without any interference from nearby level 82 warped terrorbirds, which are aggressive and attack with ranged and melee. One is at the entrance, where there are two quick tortoise spawns. A second is at the end of dungeon where there is a room with two warped tortoises alone which is not generally used by bots. This could prove useful for those on a Slayer task, particularly if players have 96 Summoning for a Pack yak. Some players may however find it unappealing to run through the length of the entire dungeon, tanking ranged attacks inflicted by the huge numbers of Warped Terrorbirds along the way.
At one time it was possible to heal using Guthan's set even when the tortoises were not made vulnerable by the crystal chimes. This was because at one point Guthan's set counted potential damage inflicted on foes even when actual damage was not possible due to prayer or other invulnerability. An update on 9 June2009 fixed this bug.
Warped tortoises are the highest levelled monsters to drop cabbages.
If you have a slayer Daily Challenge and you attack a tortoise without a chime, you won't be able to do any damage. But if someone else subsequently kills the tortoise, it will still count towards your Daily Challenge.
There seems to be a glitch where warped tortoises are immune to stuns; if stunned with Impact they will be unaffected, while if Asphyxiate is used the first hit will not stun while the remaining hits will.