As a huge fan of spiral knights I have designed a boss, his name is rotor, he is the picture i drew: http://i56.tinypic.com/2958odx.jpg
Anyway Rotor is a tier 2 boss and i do know there is already two tier two bosses but the difficulty i have designed him at puts him there.
Anyway rotor may be a boss of the power complex, i dont know you can decide but heres how it works.
Rotor Comes Down by a claw that drops him this big red eye then opens then his arms (Figure A on the drawing) spawn out. his arms clamp to the side, adn the space in between them fire bullets that gun puppies fir and spawn enemies of your choice i havnt decided on that.
Rotor's arms have 500 HP each and when one is destroyed is retracts back into rotor, after all four arms are retracted rotor's eye close and he is vunerable to hit, rotor's main body has 1500 HP and after 500 damge is dealt to it the eye reopens and his arms spawn out once again.
this i call round 2 but its the same idea as the first part except with more enemies, and again after dealing 500 damage to each arm he is vunerable to hit till 500 MORE damage is dealt. Now the last phase of rotor is different, his bullet firing sections glow red and he shoots a laser (like the roarmulus twins but only 1 beam) he then rotates into jagged positions. this means for examples the arm fixated on the right moves to the bottom and the bottom moves to the left and so on. this has four adjacent moves so the right arm after all four 90 degree turns should return to its place. then bullets again fire and you have to destroy his arms. if players take too long to destroy all arms this round (take over 3minutes) the laser re-fires and rotor rotates. after rotor is again able to hit after the last 500 damage rotor is deafeated. i understand with a party of 4 rotor's main body health is very weak so that is expected to be altered. after killing rotor players obtain 1-5 Courages Cogs or 1-5 Clogged Cogs, whichever name you prefer

I Hope you like it, any suggestions?