Sea Emperor

The Sea Emperor is a Sea Creature that can appear while Fishing once a player is  or higher.

Spawning
The Sea Emperor can be fished up in any body of if the player has reached. The base chance for a caught Sea Creature to be a Sea Emperor is.

Jerry's Workshop
The base chance to fish up the whilst in  is. If a Fishing Festival is active, the chance to fish up a is.

Oasis
The base chance to fish up the whilst in the  is. If a Fishing Festival is active, the chance to fish up a is. If a Spooky Festival is active, the chance to fish up a is.

Bait
Without using any sort of bait, the chance to fish up a is. Using brings the chance up to.

Purpose
If the player brings a to  in  in the Mushroom Desert, he will sell a  for a limited time. It can be purchased from his shop for.

Trivia

 * Despite the Sea Creature Guide referring to this creature as Sea Emperor, its in game name reads instead as The Emperor.
 * There was a bug with the Ink Wand's ability and the Explosive Bow's explosive arrows, where if the Sea Emperor is killed by either of these it can drop multiple skulls and have a higher drop chance of rare items. This is because the Sea Emperor is technically two mobs, and the ability kills both of them at once, causing double drops. This was fixed in the Community Update, patch 0.9.
 * The Sea Emperor targets other players if it has been hit by another player. If all other players that have damaged it are killed, it targets its summoner.
 * The Enchantment Book drop was bugged from the Sea Emperor's loot table for a very long time until it was finally added with the Crimson Isle update.
 * It's currently the strongest Sea Creature that is not restricted to an area.