I had the honor of concepting the main bosses for Ark Aquatica, developed by Snail Games USA.
The Cymathoa is a giant parasite based off the tongue-eating louse, and infected the mouth of the Monstrocetus (a giant whale-like creature), effectively replacing it's tongue. The mouth also exhibits a crystalline mutation caused by the Monstrocetus being exposed to the Overseer. Players must venture inside the Monstrocetus to cure it of the Cymathoa. The mouth of the Monstrocetus forms the battlefield of this boss fight.