I didn't find that fight overly difficult. You should try Twisted Rune if you like, but I don't think your levels are quite sufficient to win (not easily anyway).
I got lucky when I fought the Twisted Rune and one of the enemies spellcasters cast Meteor Swarm and totally wasted a bunch of her own allies. If that wouldn't have happened, it would have been fairly difficult for my lvl 15-18 party.
Oh, btw, get the shield of balduran and/or the cloak of mirroring before you tackle the Twisted Rune, it can make things a wee bit easier.
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