Boss
From SpiralKnights
Bosses
Bosses are found at the end of every tier. There are only 3 bosses in this game but all of them are really tough.
(DISCLAIMER - I do not own the photos. I copied them from the respective boss pages.)
Tier 1:
http://wiki.spiralknights.com/File:Monster-Snaborlax.png
Said to be a massive beast draped in living shadows, this dark predator enjoys toying with its prey before delivering the final blow. It is advised that only Knights who have mastered Tier 1 take on this formidable beast as those who have entered unprepared have never returned! (in the words of spiral knights)
Tier 2:
http://wiki.spiralknights.com/File:Monster-Royal_Jelly.png
A huge jelly said to be the king of jellies. He isint very good at attacks but his minions do good damage. He sacrifices his minions to heal himself and thus seems invincible. But his healing is quite low in rate and number. Those without 4 star gear wont find this easy. It is best to go with a party. Do not try to do it solo unless you have mastered it.
Tier 3:
Lord_Vanaduke: http://wiki.spiralknights.com/File:Lord_Vanaduke-Mugshot.png
As the name suggests, Lord Vanaduke is the Duke of the Almirian Empire. You can see his flag in the Jelly palace and in the scarlet fortress. He is said to be a zombie because it says in the fire-storm citadel that he died in history. He is very hostile to all and thinks everyone is after him. Not much is known but I would suggest you don't fight him until certain bugs are patched up as they might make it more difficult.