Ceadeus

Ceadeus is an extremely large whale-like Leviathan that first appeared in Monster Hunter 3. It lives in a similar habitat to Lagiacrus, but is unable to come onto land. The area in which this creature is fought is a large series of underground caves and underwater ruins. The battle is separated into 2 parts: the first part shows a clip of the monster swimming just outside your camp, before diving down into the cave networks. What the hunter must do is pursue it on its journey and hurt it on the way. It swims through 2 areas, the first being a slim canyon, and the 2nd being a canyon opening up into a small round area. Like Lao-Shan Lung, the attacks it uses on its journey aren't aimed at the hunter, as they are mainly flicks of the tail and quick turns.

After following it through two areas you reach the final area. It looks like an underwater arena with Ceadeus in the middle. A clip then shows its chest and chin lighting up blue, which turn red when it goes into rage mode. At this point it uses new moves, ranging from basic leviathan attacks to its signature move, Current Storm in which it sucks in an incredible amount of water and blasts it out at the hunter or the surrounding area. In the area there are small caverns to hide in.

Its right horn is a much thicker than the left one (the one you can see in the pic) and completely covers its right eye. It can be cut off and carved. Its neck resembles Lagiacrus's hood like structure, but with a large furry mane underneath. Its beard can be broken and the tail can be destroyed. The quest can be taken multiple times, with Ceadeus unable to recover it's health between quests. Eventually it can be killed.

Ceadeus is the first monster you fight that has the Dragon status effect, and it has been confirmed that this status effect decreases affinity for a fixed amount of time before disappearing. Other monsters capable of inflicting this ailment include Deviljho and Alatreon. This status ailment is unique to monsters with the dragon element. This monster has its own Sword and Shield, Great Sword and Switch axe.