Mycelium Whip

The Mycelium Whip is a Hardmode flail that is dropped by the Mycelium Mimic. The flail head releases homing mushroom projectiles as it travels, which deal half as much damage as the actual ball-and-chain and inflict the Fungal Growth debuff, which deals 5 damage per second for 2 seconds.

The flail head can be extended up to 32 tiles before returning. As it is a 'launched' flail rather than a 'thrown' one, it cannot be flailed around as you walk, immediately disappearing upon its return.