Static Disruption: This is a 35,000 damage AoE ability that'll hit anything within 12 yards of Akil'zon and leave a debuff increasing nature damage taken by 25%. If you have the ability to do so, dispel the debuff on the tank
Call Lightning: A big chunk of nature damage periodically slapped on the tank
A crapload of amazingly annoying non-elite brown eagle adds
Plucked: Periodically, a large white eagle will swoop down, grab a player, and fly slowly around the enclosure. Until the eagle's killed, it'll just keep carrying the player (who will also lose about 5% of his/her health per second), so you need to prioritize killing it. The saving grace is that you can still heal or DPS while you're being carried
Electrical Storm: Every so often, Akil'zon will target one player to toss in the air, creating an electrical storm all around him. Unless you're in the “eye” of the storm – i.e., directly under the targeted player – you'll take an increasing amount of nature damage each second
Collapse on Akil'zon before the Electrical Storm ability so that players never had to run far to get to the eye of the storm