Belmarniss can now sorta muddle along in the local common thanks to aggressive use of comprehend languages to hand-translate books after roping a local into teaching her the alphabet. Also she hates teleport traps with every fiber of her being. Also she has figured out at this point that she somehow leveled in sorcerer instead of wizard during the business with the pirates and has no idea why that happened or whether it will happen again. And she has sold this stupid arrowhead to two different curio shops and given up as it seems to be cursed. And she just needs to keep doing what she does, she guesses, till she can teleport herself home. The Yawning Portal is a nicely ironic name.
"It's a hall of enchanted mirrors - most of them are full of treasure, but one is a Mirror of Opposition, and if you look into it your reflection will come to life and try to kill you. Inconveniently, I have reason to believe it's the hiding place of one of the other rods. -but before you ask, I don't know about the fourth or fifth, I just know that Halaster has a particular fondness for the Hall of Mirrors and he'd hate to neglect it."
"Hrmm... there's a cache of gold and gemstones in my desk, which I've been collecting for no particular reason except general magpie instinct. You're welcome to it, as long as you continue not to kill me; theoretically you could kill me and take it anyway but it'd be terribly rude. Other than that, I can't really think of anything."
"It wasn't all that much trouble to take him down in the first place," Garrus points out. "I don't see much problem with letting him walk, on the understanding that if he hassles us any more we won't make the same mistake again."
"Delightful. Where's your desk? Oh, also, what do you eat down here? Haven't passed any mushroom farms."
"My desk is in my office, the door to which I came through in my attempt to crush you. The monsters of Undermountain are actually sustained by Halaster's magic, and fortunately, like the teleportation ward, it's one of the spells that didn't vanish when he did, otherwise we'd be in quite a pickle and would likely have resorted to cannibalism by now. Not that we are not occasionally anthropophagic, but I wouldn't want to live off my subordinates."
"Yeah, that's not sustainable." She pops out from behind the table, doesn't turn her back on the boss, and heads for the desk.
"At the end," Garrus says firmly. "With the exception of immediately useful magic items. If we don't trust one person to carry the loot, something's wrong."
"Magic items are so dang cheap on this planet," she mutters, dumping the loot into the bag of holding.
Deekin shakes the bag a couple of times, then closes it up and shoulders it again. "Deekin find bag in ruins of Undrentide. Deekin find like six bags of holding in ruins of Undrentide actually, but most of them go to Boss and Boss die in big mythallar explosion so Deekin not have them anymore."
"Very shiny very magic crystals, held up lost flying cities of Netheril including Undrentide, all destroyed except one, that one destroyed later. Explode very impressively. Detailed in book."
Deekin grins toothily. "Huzzah!"
They leave the ogre mage whose name they never got, and head back toward the central chamber.