The Overgrowth Staff was a craftable summon weapon. It spawned an Overgrowth Spirit minion that remained stationary above the player's head and fired small leaf projectiles at enemies. Like other minions, summoned Overgrowth Spirits were invincible and followed the player for an unlimited amount of time, unless the player died, summoned a replacement minion, or cancelled the buff.
Its best modifier was Ruthless. The Mythical modifier provided the widest array of stats bonuses, but these primarily affected the initial summon rather than the resulting minion. Additionally, Minions couldn't deal critical hits. The only significant advantage a Mythical Overgrowth Staff had over a Ruthless one was knockback.