Jafin,
I'm trying now to play with Zenmaster, but do not know a way to weaken him (sorry

). To make a game more balanced I turned all game options to Hard and created a 2-member party (ZenMaster&newly generated character).
Most frequently killed person in this game is that second party-member since Zenmaster casts a lot of area harmful spells

But it still is a fun!
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Sincerely Yours,
Tanda