You can find Shrew Chisi, the assassin you must kill for the 3rd Bushi Dojo quest, in a smallish clearing on the northern shore of the lake north of Ishad N'ha.
To clarify the Grue Morde quest, it is a special quest required of the party's Assassin, given by the Pawn Shop in Ishad N'ha. To become an assassin, Raskalion in the Stout Mines has to be eliminated for Scanthril, who then gives you the Assassin's Dagger. The Pawn Shop in Ishad N'ha or Brimloch Roon will then offer the role of Assassin to the bearer of the dagger, which will then be taken from you. (Though you can keep the dagger if you really want it! Just a little sleight of hand, not tough for a crafty rogue, hehe. )
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