Demon Lord

Was available during the Olympic Games event in the summer of 2012. Those were dropping s and Midsummer Suits items.

Demon Lord level 30
It were located on the Razorwind Bridge in Chasm of Despair (a lvl 30 area). It have a total strength of 20000. It come with another 14 invasion mobs each with 3000 strength. The boss itself have 5400 strength.

This one deos not drops any Midsummer items, but it drops COG flames.

Demon Lord level 50
Located in the Stone of Gildiss, Chaoshaven (a level 50 area).

Is level 50, with 72000 total strength. Have 15 invasion mobs each at 8000 strength. The boss itself have 18000 strength

Demon Lord level 80
Located on the Frozen Ossuary, a level 80 area.

Demon Lord level 105
Is located in the West Barracks, in the War Fortress (a lvl 95 area with the access from Inferno).

It have 660000 total strength. It come with another 29 invasion mobs at 30000 strength each. The boss itself have 165000 strength.