I had the honor of concepting the main bosses for Ark Aquatica, developed by Snail Games USA.
The Monstrocetus is a giant, mountain-sized whale imprisoned by world-roots deep within the seas of Aquatica. The player must venture inside the Monstrocetus to cure it of a parasite infecting its mouth (think Lord Jabu Jabu of The Legend of Zelda: Ocarina of Time).