The final battle of Throne of Bhaal is INSANE.
Did I say final battle? I lied. It's FIVE battles, with BOSS BATTLES BETWEEN EACH FUCKING BATTLE.
It starts with the Final BossTM right in front of you. I easily kick the boss to pieces, and have to go to a little platform where I fight the Elemental Prince of Air, two Vampiric Mists that are Hasted, and two Greater Air Elementals. You might recognize this as what is colloquially referred to as "Bad fucking news". I beat them into bloodless death, and now must fight the boss again. This time she summons a shitpile of Bone Fiends and does some Time Stop and some spell casting. I defeat her with minor injuries (Read: Injuries that would kill literal ARMIES of lower leveled characters) and move to the next platform, where I fight Cryozar, Prince of Ice. He conveniently announced this to me, so I fireballed his Too Dumb to Live ass into a puddle of water. Again, I fight the boss. This time, she summons TWO FUCKING MARILITHS (Think a Naga, except magic, bigger, and made of Demon) and a shitpile of Bone Fiends. Then she summons several Shadow Slayers, which are... Bad fucking news. Then she time stops and summons a FUCKING BALOR.
I. Kill. It. All. I finally beat her into submission with a Planetar at my side, half my party dead. Thankfully I have two Rods of Resurrection, so everyone just GETS BACK UP FROM DEATH, and we go to the third platform, which has two Mariliths, an Alu-fiend, a Succubus, and a Fallen Solar. I kill all of it but the Succubus, who charms my Paladin. My Paladin then proceeds to curbstomp my entire party by himself, thereby proving that nothing the game could ever throw at me is nearly so dangerous as my Paladin.
God. Damn. It. I didn't die like a bitch. I cast down entire armies of the foulest monsters to plague the Forgotten Realms, I FOUGHT A GODDESS IN HAND TO HAND COMBAT AND WAS WINNING. I CAN SUMMON FUCKING ANGELS, MULTIPLE ANGELS. My fighters can kill armies in moments, my mages can STOP MOTHERFUCKING TIME AND CAST ALL THE SPELLS. My clerics can banish the mightiest lichs WITH TURN UNDEAD.
I died because of Charm Person. FFFFFFFFFUUUUUUUUUUUUUU-
Baldur's Gate 2 Throne of Bhaal