Soul Catchers are stationary orbs that spawn swarms of butterflies which slowly fly towards the player, causing damage on contact. The butterflies can be destroyed, but cannot be deflected.
A Dire Soul Catcher, referred to as the Butterfly Ball by Zagreus, appears as a miniboss encounter in Elysium. In addition to spawning butterflies, it will constantly spawn Elite Disarmed Souls, up to five, that will seek out the sword, spear, shield, and two bows littered around its arena. Under the Middle Management pact, it will also periodically teleport around the room.