Sun of a....

 Sun of a....  is a Cataclysm heroic dungeon achievement needed for the Glory of the Cataclysm Hero achievement, rewarding the.

Strategy
This achievement is largely a DPS race, although there's still some luck and skill involved.

During the fight, Rajh uses various special abilities that consume energy. When his energy reaches 0, he moves to the center of the room and begins to channel Blessing of the Sun. This spell recharges his energy to full over 20 seconds, while dealing damage to the party and increasing damage to Rajh by 100%. As such, cooldowns should be saved for this phase, and heroism should be used such that the last 20 seconds coincides with this spell (perhaps used when Rajh is at 20 or 40 energy).

Rajh has a number of special abilities which he uses at random. All of them consume energy, but some are instant while others have a cast time. The latter should always be interrupted, as this will prevent the consumption of energy and buy time for the party to kill him. Summon Sun Orb has a long cast and is easy to interrupt, though Inferno Leap has a short cast and requires better reflexes.

Unless the party has very high DPS, the random selection of abilities adds a measure of luck to this achievement, as the time available in each attempt varies. If this is the case, it may be desirable to intentionally wipe unless a certain number of spells (e.g. 3) are interrupted prior to Blessing of the Sun.