Moon Leech Clot

The Moon Leech Clot is an essence which is taken from the player when the Moon Lord's tongue grabs hold of the player. If it manages to reach the Moon Lord's mouth, part of the boss will be healed by 1000 HP. They can be destroyed easily with most Hardmode weapons.

Trivia

 * They look exactly like the Living Ultrabright Fire Block sprite-wise, but they are not animated.