Dirkee is a level 80 rare elite found in a few different locations in the Storm Peaks in Northrend. The locations he can spawn at are shown in green below. He has approximately 50k hp and he hits pretty hard so don't take him too lightly. This npc is part of the Northern Exposure and Frostbitten achievements. He most often drops Titanium Brain-Gear which is a level 76 bind on equip ring with a random enchantment. About 10% of the time he will drop Dirkee's Superstructure which is a level 80 bind on equip 2 handed mace . Like other Northrend rares, he also drops Abandoned Adventurer's Satchel, which generally contains about 20 gold, a full stack of frostweave cloth, and often times a few crystallized elements.
Dirkee hits pretty hard. If you are above level 80 he shouldn't be too tough, but those leveling in the area that come across him should take some extra precautions. He does a kick called Mechano Kick which has a 40 yard range as well as an ability called Suppressive Fire which deals fire damage. Dirkee's corpse can also be salvaged by engineers.