Reincarnated as leviathan

A man dies due stupidity of others and reincarnates as a monster " mm.. Where am I?" " WHAT THE HECK IS A leviathan" System: " leviathan:the most ancient, terrible, terrifying, abominable, cold, ruthless, and gluttonous of all monsters some of the bigger ones of the species are capable of swallowing a whole mountain in one chomp. This species is thought to be extinct" Join him on his journey to... Well he has no goal really... Note: I don't own the picture