Using Heinrikk's strategy, this guy was fairly easy to duo with my tank mercenary (76 Druid 726AAs, J1 tank merc, no outside buffs or help).
First off I killed his two 'nervous guardians', fairly easy mobs, not too much harder than the regular mobs around the place. After this the Lightning Lord became active, I burned him down to about 30% when he summoned his last add then evacced. Came back, and as previously stated, the adds do not assist him other than healing him to full whenever he gets too low.
3 of the assistant adds down and I got some respawns of the regular dragorns, after the regulars were down I was really low on mana so I evacced and came back again, he was still up and so was one of his adds (presumably if you have next to no mana this would be doable via burning him down once, evaccing when the add sacrifices himself and repeating until all are dead). Burned him down the add did not sacrifice himself, and looted my shard.
Chest spawned with a nice pure caster neck with the MMM clicky on it.
The Lightning Lord was a yellow con at 76.
Edited, May 7th 2009 7:39am by SaninnOfKaneBayle