Here is a list of currently available bosses:
Level 1:
Ganudo
Bloodseeker Warband
Level 2:
Larren Orhdir
Dark Stone of Orox
The River Knight
Level 3:
Julie, the Red Maiden
Weredigo, Undead Wendigo
Level 7:
The Servant of N'Jal
Mechoid
Level 8:
Daelus Orlouge
The Smiling Lads Thieves Guild:
Smiling Lads Thieves
Tuloc Lereur, Smiling Lads Lieutenant
Silas Sheffier
No bosses? Submit one here.
Here is the list of currently unavailable bosses: