While you face Amalgams as the powerful Zombie-enemy type in the Terminus map, you encounter Abominations in the Liberty Falls map.
This is a two-legged, three-headed flesh-eating monster that is highly mobile and charges at you in first look. Its back has large tendrils with pointy ends.
Besides the grotesque appearance, this enemy-type has a hidden attack: electric beam from mouth. If it finds you from a range, the Abomination may fire the electric beam by opening its mouth. This attack could also be used to reach you or your teammates easily when a horde of zombies stand between you and the Abomination.