I recently played WoW with some friends and the boss fights there were so amazing. The way you had to coordinate with your team to react to environment changes is simply something WoW shines at. So I thought ... why not do this in L2 too ? Bosses are boring. Here's my first attempt on 
 

• Circles of damage
• Rings of damage
• Moving circles of damage
• Breakable 2-player tethers

 

Currently I do this with namless spawns and I'm wondering if anyone has any better idea (preferably without modding the client).

 

 

Also did cooperative positioning (water pillars). If not all weater circles are filled by players, BOOM.
 

 

Tuning the difficulty ended in a wipe: 

 

Bravo magka! very nice idea and a very good attempt at it, looks very fun and has a lot of room for improvement to make killing bosses more engaging and entertaining instead of it just standing there auto attacking you while you press F1 and F2.