Flarion - He is a fire atronach, that will send out a wave of flames in front of him upon engaging him. He then explodes in fiery explosives that will cause a lot of fires on the ground. At around 50% of his health, Flarion will receive a damage shield and stomp the ground, causing spires to erupt. He also has a very nasty Heavy Attack, so that the one tanking him should make sure to block.
Ol'icath - A giant Daedroth that has a frightful stomp which will make players stumble and a flame breath that will throw the player off their feet.
Domoira - She is a very fiery Dremora, wielding a one-hand weapon and a shield. She will snare the player with talons, and then let fire meteors rain from the sky that will stun them. She also has a fiery breath attack she casts in front of herself in a cone. She also casts a large ring of fire that will hurt everyone standing inside it.
Faram-Xaran - She is a Nixad and will send out fiery flames from herself. Her most dangerous attack though is a volcano that she will call forward and that will hurt every player surrounding her, unless someone stands in it and blocks.
Kmolag
Salosuum - A titan that is accompanied by two Ruinachs that aid him in attacking the player. From time to time he attacks with a fire breath that will stun the one having aggro of the boss. He also erupts into fire and targets the player with fireballs, additionally to firepools spawning on the floor. Towards the end of his life he also calls up on two Ash Titans that assist him in his fight.
Havocrel Duke of Storms - The final boss. The player first has to fight daedric adds that seem to summon the Duke. Upon them dying, their lifeforce seems to fill up the Duke and awaken him. When the initial Daedra dies, a wave of more Daedra will appear and try to kill the player. Killing these will bring forth an even more powerful wave of Daedra, with Ash Titans spewing fire. Upon killing these, the Duke awakens and will now be killable. Bringing him down to around 83% will make him go into his shield to call forth more Daedra that wander up to him, trying to get empowered. This continues until the boss is dead.