Slimer

Slimer is a Hardmode enemy that only spawns in The Corruption and Underground Corruption. It starts off as a flying ball of slime, and when "killed" the first time it loses its wings and becomes a groundborne slimer. Slimers are actually two kinds of enemies put together, half bat, half slime, therefore they have two sets of health.

Slimer is immune to the Poisoned Debuff.

In the mobile version, they do not drop anything.

Trivia

 * The wings on the first form of Slimer are almost, if not an exact, look-a-like to Demon Wings.
 * Winged version not only can fly but also swim in water (unlike ordinary slimes that float on the surface).