Tarnesh usually gives me a problem on Good or Neutral PCs because I don't take Monty and Xzar. So typically his Horror spell hits both myself and Imoen and then he kills us in short order. This time though I had the handy new Potion of Clarity that was somewhere in the early game. Still had to deal with his Mirror Image, but it was pretty easy since I could actually attack him.
I try to interrupt that Mirror Image, since I know it's coming at the beginning of the first round. If I know I don't have the spells I need (especially Remove Fear) to take him, I usually try to come up with a justification to attack him while he's still blue. A warning from Oghma in a dream the night before, or something like that.
Comments
Viconia - Command (so Tarnesh is on the floor)
Xzar - Larloch's Minor Drain
Imoen - Magic Missile from Wand
Monty - Sling
Fighter/Mage CHARNAME and one of the Guards engage in melee.
(Repeat)
No more Tarnesh