Duekfishron

Duke Fishron is a Hard Mode boss added in 1.2.4. In order to summon him, a player needs to fish using a Truffle Worm as bait at either of the oceans. It can be summoned directly after activating hardmode, but it's recommended to have at least post-Plantera gear equipped.

Attacks:

First stage: Shoots one homing aqua ring. If this ring hits a player, then a larger sharknado (Named Cthulhunado.) will spawn beneath them, spawning more Sharkrons than a stage one sharknado.
 * Charges at a player. (5 times in a row.)
 * Detonating Bubble spray. (The bubbles are, like chaos balls, poppable.)
 * Summons two aqua rings, when the rings touch the ground, they transform into sharknados.
 * A sharknado is a huge tornado that throws a lot of Sharkronsat any direction. (Similar to the movie, Sharknado.)
 * Second stage: (He's a lot darker and eyes glow yellow.)
 * Charges at a player again. (Three times in a row.)
 * Spins quickly and releases sharknados and homing bubbles.