Lesser ghostly thralls are undead that have been resurrected via the Resurrect Lesser Ghost spell. Besides the required runes, summoning lesser thralls requires two prayer points and having the book of the dead equipped or in the player's inventory.
Lesser ghostly thralls have an attack speed of 4 (attacking every 2.4 seconds) and attack using Magic (with a max hit of 1), 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.
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.
Thralls cannot be used anywhere a Dwarven Multicannon cannot be used.