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Head south and you'll encounter two groups of five Jade Brotherhood. Turn west and move down a ramp where you'll encounter another group of five. After dispatching them, turn south down some stairs onto a balcony where Oroku (Armor Crafter) NPC can be found. Take the ramp to the west and you'll find Kenshi Steelhand among a group of four Jade Brotherhood at the bottom. Beware of one or two 5-man patrols that move through his area, if you take him down fast you should only have to deal with one 5-man patrol. The run can easily be done with a group of henchmen and should take no longer than 5 minutes.
If the quest Eliminate the Jade Brotherhood is active, Kenshi will spawn twice at the same location - one to the southeast of Oroku, one to the southerwest. His normal spawn point is to the southwest, but the quest spawns another copy to the southeast at the same time.
Kenshi will not spawn if the Chasing Zenmai quest is active.