Skeletal thralls are undead that have been resurrected via the Resurrect Skeleton spell. They were available as part of the Arceuus Spellbook Beta for testing and player feedback.
Skeletal thralls have an attack speed of 4 (attacking every 2.4 seconds) and attack using Ranged (with a max hit of 2), ignoring any accuracy checks in the process. They will attack the same target that the player is attacking, and cannot be damaged. However, they cannot attack other players.
Skeletal thralls will remain for a set amount of time ( seconds), but players can cast resurrection spells again after 30 seconds, albeit the existing thrall will disappear if players do so.
After feedback from the beta, the spell was polled in Phosani's Nightmare Poll to have three tiers instead of one, resulting in the release of the spells that would resurrect lesser, superior, and greater skeletal thralls.