Okay, let's face it. As a DM I suck with strategy. I'm a great storyteller (so they tell me) and I'm good at running the table, adjudicating, and keeping the pace quick and the encounters fair. However, I stink at making my monsters and villains behave intelligently. More than that, really. I just can't seem to get the knack of using a creatures' abilities to their full advantage.
That said...I'm having a challenge with one of my players' new character. His last character died unexpectedly, and being rather disappointed, he thought to himself, "Danged if I'm going to let that happen again soon." So he's used all his considerable DnD savvy to make a potent level 9 character. He's a gestalt Paladin/Rogue with the half-fiend template.
They faced a modified Roper last night. It wasn't supposed to be a majorly deadly encounter, but it was patently obvious that with a +17 Fort save, Resistance 10 to acid, and DR 10 (without equipment), he could have faced the thing alone and come out without a scratch.
I know level 9-12 characters are supposed to be capable handling a lot. I know that he's paid a level penalty to get that half-fiend template. And I know that a better DM would know how to challenge him without using cheap tricks. But I can't helping being a bit frustrated.
Anything that would challenge his character would outright kill the rest of the party (one of whom is only level 7). I could throw Enchanters or Beguilers at him to take advantage of his measly +9 Will save--but that feels so cheap.
Right now the party is in the Nocturnium (sort of a cross between the Abyss and the Plane of Shadow). Any ideas on an encounter that could challenge this guy, but not kill the party? Or just DM advice in general.
Muchas Gracias,
R