Genion

Genion are one of the bosses that can appear in Basement. Genion are composed of not one, but two separate "bosses": One large twin with a smaller twin attached. They both have the same amount of health, sharing the health bar fifty-fifty. The large twin is called Leo and the small twin is called Yav.
==Behavior==
*Leo will chase the player, then periodically charge at them at high speeds. Afterwards it will stop to catch his breath.
*When Isaac is close, Yav will shoot three tears to him.
*When Leo is dead, Yav will chase the player, leaving a trail of green poison creep.