

Warped terrorbirds are only found in the Poison Waste Slayer Dungeon.

During the quest the player witnesses a blue, female warped terrorbird being disposed of in this fashion its examine text, like that of the attackable birds in the sewer, is "You don't think you can harm this terrorbird". These "factory seconds" are disposed of by sending them to the sewers. The machine does not always work properly, and when the machine malfunctions, the defective terrorbirds end up with unusual growths and are presumably weaker or unintelligent. Guard no.72 is an example of such an enhanced terrorbird. It is revealed during the Prisoner of Glouphrie quest that the Arposandrans breed terrorbirds and then put them through a machine to make them stronger and intelligent. They can also target the player even if there are obstacles on the way. If the player uses the crystal chimes on it, it will immediately retaliate, and its spawns will also be aggressive. They will always be aggressive towards the player, even if the player does not leave the area. (However, as the ranged attack hits almost 100% of the time while the melee hits much less often, it is advised to use the Protect from Missiles prayer for less total damage). Their maximum melee hit remains the same, however, so Protect from Melee may be helpful. It is best to know where to find the least amount of terrorbirds as multiple terrorbirds can hit up to 100 in succession. This ranged attack will hit twice, so players can be hit up to 40, though this is very unlikely.
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In other words, using Earmuffs, Masked earmuffs, Slayer helmet or a Full slayer helmet reduces their ranged attacks' maximum hit to 20.

It is worth noting that the terrorbird's ranged attack is sound-based, so ear protection could prove useful. These monsters are weak to melee, most notably slash weapons such as the abyssal whip and chaotic longsword. Once terrorbirds, these mutants are stronger and used for guarding the city of Arposandra. Warped terrorbirds are the result of Glouphrie's experimentation with the Anima Mundi.
