Lets get a bit of background on this. As far as lore goes, Loken is one of the titans (i.e. creators of all the world) and leader of the Iron Dwarves in Northrend. At some point, he bacame disillusioned with the pantheon and was swayed by Yogg-Saron, one of the old gods. He is a big part of the troubles that have brewed in Storm Peaks and one of the reasons the earth giants there (Vanir, also known as Sons of Hodir) are at war with the Storm Giants (Aesir
In game terms, he is the last boss in Halls of Lightning, the higher level of the two five-man instances in Ulduar. He is also responsible for killing more players than any other boss, even those in Naxx - Patchwerk makes #6 on the list. So what does he do that makes him so lethal?
Well, a couple of things. Three actually:
- His first ability is called Lightning Arc. It is a stacking debuff that does damage to the target and has a chance to apply the debuff to any other characters within a short range.
- Then there is Pulsing Shockwave. This is a damage wave thatpulses every three seconds and does more and more damage the further one wanders from the boss.
- His last ability is his most lethal one: Lightning Nova. Every thirty seconds, he will start casting this spell. Once he is finished, everything within a 15 (or maybe 20?) yard range of him is generally annihilated.
The strategy I have found works the best is this: ignore the Lightning Arc. That's right. Ignore it. Stack on top of each other. The other characters are your friends. The healer is your BEST friend! Most healers will be able to use multi-target heals (chain heal, circle of healing, wild growth) to keep everyone alive through the damage done by the Lightning Arc. While he channels Lightning Nova everyone needs to move TOGETHER in the same direction to get out of it. If one person goes in a different direction, they will likely die to the Pulsing Shockwave. Staying together accomplishes a couple of things. Everyone stays in range of multi-target heals and it minimizes the time spent in range of the Pulsing Shockwave since, upon finishing his casting, the boss runs to the tank just as the tank runs to him. Rinse and repeat until Loken bites the dust.
Other than encounters where sheer damage output absolutely crushes gear level (Lady Vashj, anyone?) this is, hands down, the most difficult encounter to heal that I have encoutnered in the game. I imagine it would be even more challenging for a healer that cannot heal on the run (the way tree druids can) like a restoration shaman or a holy paladin.