Floaty Gross

The Floaty Gross is a floating Hardmode enemy that spawns in the Underground Crimson. They can float through blocks in a manner similar to Wraiths and can inflict the Weak debuff. They are immune to all debuffs except for Frostburn from the Frost Armor set, and the Ichor debuff. Because of their low knock-back resistance and ability to pass through walls, weapons with low knock-back will be more effective against them in the narrow confines of the Underground Crimson.