Good tags... I mean gutentag!

25 man encounter - 25 or more needed to kill this is a VERY fun fight (much more so than anything Blizzard has)

Harazius (lvl 255) - 5,500,000 hp, 3000-5000 base damage
Captain Krask (lvl 250) - 1,000,000 hp, 1000-1500 base damage
Captain Grark (lvl 250) - 1,000,000 hp, 1000-1500 base damage
General Malaus (lvl 255) - 2,500,000 hp, 2000-3500 base damage

Since GMs can't program NEW spells, I've decided to use "old" spells!

Captain Krask - Drakonid model (vulnerable to cold - like the Tinman in Wizard of Oz event)
Cleave - Nefarian's Cleave
Whirlwind - Sartura's minion's

Captain Grark - Drakonid model (vulnerable to cold - like the Tinman in Wizard of Oz event)
Thunder Clap - like Rajaxx from AQ20 - reduce hp of nearby players by by half
Cleave - Nefarian's Cleave

General Malaus - Drakkisath model (highly resistant to fire)
Piercing Howl - like the warrior talent, if there exists a mob version great... if not there's an AOE slow somewhere I forget
Conflagrate - Drakkisath's conflag

Harazius - Eredar model (highly resistant to arcane and shadow)
Void Zone - Kel'thuzad's spell (deals 25k shadow damage, it lies on ground for 5 seconds before activating)
Shadow Bolt Volley - Doom Lord Kazzak's version
Arcane Volley - Talon King Ikiss's version


I could imagine this taking place in Ony's lair, but some people might want their t2 helm... the only way to resolve this is to set this boss's loot to t5 helm

nice ideas keep em coming