Check the
Tactics Mod README for details about Kuroisan. [img]smile.gif[/img]
In general, he is a Kensai(13)/Mage(14) who is obsessed with Katanas.
As such, if you have any unique Katana - Celestial Fury or Malakar, he will come and ask for it. You'll probably refuse, and he... Well, he won't take no for an answer.
It's a tough fight.