Dreadnautilus

The Dreadnautilus is an early Hardmode mini-boss summoned by Fishing during a Blood Moon. It is the second boss in the game to be summoned via fishing, the other being Duke Fishron, and, unlike Duke Fishron, it does not require any unique bait. You simply need to fish during the Blood Moon to summon it.

Attacks

 * Spin Attack - Spins around the player for roughly 3 seconds. Upon contact, it will damage the player.
 * Dreadfire - Rapidly fires a spray of red projectiles at the player. During this phase, the boss will turn invincible.
 * Symbols - It briefly glows illuminant crimson and summons three red symbols.
 * Squid Summon - Spawns multiple Blood Squids, which will attack the player.

Tips

 * Summon weapons are useful for handling the Blood Squids while the player focuses on the Dreadnautilus.
 * Using the Chum Caster gives the player a greater chance of finding the Dreadnautilus and other blood moon fishing enemies, this combined with Chum Bucket s will give the player the best chance to find them. The use of Sonar Potions will allow you to skip past other blood moon fishing enemies, letting you fight the Dreadnautilus more over the course of the night.

Trivia

 * It is the only boss or mini-boss without a boss bar.
 * It is one of the only mini-bosses lacking a trophy and any Expert or Master mode drops.
 * It resembles a.
 * Its name is a portmanteau of "Dreadnought" (a class of warships) and "nautilus."


 * Its original name was "Blood Nautilus" in an official trailer.


 * It was shown in the trailer for the 1.4 update