Polarities Mod/A Throng of Eyes and Fliers

A Throng of Eyes and Fliers is a Pre-Hardmode book that is purchased from the for  after the Eye of Cthulhu is defeated. When used, it causes a friendly Servant of Cthulhu to be spawned that loosely homes in on nearby enemies, dealing damage on impact up to six times before disappearing.

Trivia

 * Its title references the epic fantasy novel series A Song of Ice and Fire.