This fossil likely belonged to a large guardian relative, I've noticed a lot of similarities between the fossil and the elder guardian, maybe it was a relative, so I made what it probably looked like and here's what came out, it was likely a large predator, using its razor sharp teeth to slice prey, it was a slow swimmer due to its flat face, I knew it was aquatic because its skull was too big for a terrestrial, even the largest animal skull on land was still small compared to this.