The group was:
Monk 27 (The Inscrutable Master Girard): Built for kama use. Convinced that Monks were powerful caster-killers due to all-good saves and spell resistance. Smacked into a violet warding and failed his save, resulting in his transportation to Avernus.
Fighter 17/Kensai 10 (The Duke of Truth and Loss): TWF, convinced his sheer number of attacks > any enemy. Espoused that fighters are versatile due to their many feats. Killed by summoned balor.
Wizard 27 (Kratos): Evocation specialist, banned conjuration and abjuration. Didn't understand why blasting is sub-optimal. Killed by summoned balor.
Swordsage 20/Master of Nine 5/Rogue 2: Focused on Shadow Hand and Diamond Mind, fought with a greatsword. Fairly competent, was tragically killed by a summoned balor.
Bard 27: Tried being a buffamancer, got taken out by a warding that turned him to stone when he tried to charge the wizard.
Cleric 27: Priest of Elhonna, memorized healing spells and summons. Called several animals to the battlefield (that couldn't penetrate the wardings) before being taken out by the summoned balor.
Hexblade 27: "It's magic AND melee, man! You can't beat that!" Except the balor did, to the merry tune of the mage drinking martinis.
Compwar Ex-Samurai 17/Ronin 10: "Class flavor and mechanics aren't separate, man! If you wanna be a samurai you should just play one!" Sadly found that even the fighter did better. Killed by summoned balor.
Noticing a theme here?