In the Rogue Stone Doorway the vampire again messes with you, so probably use a potion of invulnerability. Not that you'd need the place for anything.
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For Baal's Tears get +3 STR, immun to weapons, saving throws, whatever the black dragon gives for talking it, and the only dubious choice is the selfishness. But with the already crappy AC loosinga DEX I think would further ruin the situation, so I went evil. I mean the MR on this character isn't great either way. 25% now, would be 35% with the tear, and wielding the BG2-sword of balduran would give another +10%, but that's it.
EDIT:
Against Irenicus dran a Potion of Power, and Potion of Invulnerability, then started whirlwinding him away. When he casts his second mislead (along some mantle which makes him untouchable) is the time to turn to Slayer Form to avoid being imprisoned.I think this was the intended story (SlayerIrenicus vs Slayer Protagonist), only this was the first time I used this option.To gain back the reps, do some of the optional stuff at the start, like resurrecting that guy, helping the elves or the dwarves...
Hardest Monsters in BG2:
demon knight (from BG1) adamantite golem unseeing eye Kangaxx, the demi-lich Firkraag Bodhi
I think Irenicus and Gromnir only give quest exp, that's why. Gromnir is also bugged. At least he and his cohorts posed no problem.
Entering Marching Mountains: a shield amulet charge, hardiness, kai before entering, then whirlwinding everyone.
For the rest inside drink a potion of fire res, and use hit&run tactics. You'll still need Extra Healing Potions, but whatever.
Against the shambling mounds of Nyalee the longsword specialization proved useful, as they are only voulnerable to slashing damage (and two type of elemental damage, according to Flail of Ages +4). They are immun to piercing and blunt damage.
LAST EDIT FOR THIS:
Get the BMU, and you'll have -23 AC. At Sendai herself though, just use a shield amu charge.
There are some annoying parts left, like fighting mindlyers (INT-drain), Draconis/Abazigail (80 dmg breath weapon spam), Ravager (stun spam), against what no character can do squat anyway. At least Kensai kills everything fast. I mean realy fast.
I don't evencare to finish Melissan, because what's the gain there? I KNOW I can beat her, with ease, there's no challenge.
So, bard is the worst class, monk and kensai have problems at certain stages, other characters (like druid, cleric, thief) have certain problems but just get over it, and spam cheesy abilities like no tomorrow.
I'm done with this.