Fargo's Mod/Mind Break

The Mind Break is a summoner weapon dropped by the Brain of Cthulhu. On use, it'll summon a miniature Brain of Cthulhu alongside a Creeper. The Brain of Cthulhu will slowly move and teleport towards the player, with the Creeper bouncing between it and the enemy. Using it again with empty minion slots summons more Creepers to attack enemies.