strixo: I laughed my head off at the first mage at FOA. The dude doesn't bother walking up to you before talking to him - he talks to you from a distance. And is soon as the convo is over, youre toast. Another encounter that got me was the bard's employer that wants you to kill a couple guys. Best to just leave that encounter for later in the game. She is/was stoneskinned.
But the four little dwarf monsters in Durlag's Tower. Good grief. They were the worst enouncter, for me, in the entire game.
Fun to try though, if you've gamed BG1 so many times that you play all the fights on autopilot.
I've never tried SCS; I usually go with Tactics & Ascension in my BG2:SoA & ToB playthroughs.
I don't have any combat-enhancing mods on my BG1 playthrough, nor do I use BGTutu or Big World; juss straight BG1 + Fixpacks + BG1 Unfinished Business + script so that the game doesn't end upon killing the final boss (so I can play TotSC after I finish the main quest). Even with all that, I still find the combat in BG1 very challenging! I don't charge into fights when the game gives time to think about it, do my best to be prepared for surprise battles, and yet I still find the game very challenging!
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BG1 SPOILER - don't read if you aren't fully familiar with the story; I don't want to ruin the story unraveling for you in your gameplay)
The way I play also makes sense from a roleplaying perspective, at least according to my logic. There simply isn't enough high-level mages wherein they're easily affordable, especially for the folk seeking Charname. They are the Iron Throne's side project (they normally don't operate on the Sword Coast). What's more, it's not the main Iron Throne bosses seeking Charname; it's the son, who is given assets to oversee the banditry operation, not the assassination of some kid whose spent all his life in a library! Thereof, it makes sense that the first assassins that Charname encounters are the incompetents Carbos & Shank, then Tarnesh at the Friendly Arm Inn. The assassins get progressively more talented as Charname grows in power, which coincides with the Iron Throne making more money, and thus more coin for Sarevok to spend hunting Charname (keeping in mind that most Iron Throne folk, both above & below Sarevok on the food chain, don't know the real reasons he's hunting Charname for).
BG2 is a different story, as it takes place in Athkatla, one of the most profitable cities in the game world of Toril. Talented magic users will certainly be present, despite the citizen's fear of magic. It even shows without SCS, I find.