I'm playing vanilla BG2 with TOB - no mods at all yet. I'm looking to find out what additional, generally missed battles there are in the game. For example, I had a quick but cool battle with Rune assassins and wizards when attacking Darcin Cole in Umar Hills after agreeing to get the silver dragon's blood. Similarly, a return to Athkatla, without meeting the Windspear Hills guy, but after killing the 'disillusioned' paladins, spawns a high level group of Radiant Heart paladins and priests who attack the party.

What other ones are there - not run of the mill quest battles?