Bosses

The different bosses are:

The Godwars bosses, Kree'Arra, Graardor, and Zilyana , plus there respective minions.

King Black Dragon

The Dagannoth Kings, Dagannoth Supreme, Dagannoth Rex, and Dagannoth Prime

Tormented Demons

Corporeal Beast

Sea Troll Queen

Lakhrahnaz

Nomad

Giant Sea Snake

Avatar Of Destruction

Frost Dragons

All are available in the bosses/more bosses tab, with varying degrees of difficulty.