As we return to the depths, we pass the kenku, who are abandoning ship
(and playing sonic pranks).  At the center of the complex is a ziggurat,
which we investigate.  The ground floor is empty, so we carefully climb
the stairs to the second floor, and find a genie.  And a vrock.  And a
quasit who was carrying the control object for the genie.  One good
AoE and the quasit drops the control object (a horn), which we destroy
to release the genie (the vrock we have to put down the hard way).
8500/6.5 xp.

The genie is happy to be released from service as it's been quite a
while, and while he's preparing to move back into his old quarters on
the elemental plane of air he dumps a ton of random stuff and debris for
us to loot.  Six overcharged vials of bottled breath (3 charges each,
one charge allows one to cast gust of wind or to hold one's breath for
one hour (but you can't talk, or you lose it), 5% chance of damage when
using), winged boots (4h flight, recharge 2h/12h unused), 2500 gp of fine
clothing, 600 gp of random stuff, 2500 gp goblet.  The genie mentions
in passing that Arecee's wings are, in fact, illusions - she's just a
normal elf, not an averyel.

Searching the rest of the ruins we fight off a cloaker.  3900/6.5 xp.
1200 gp of jewels and the like, raven figurine, pipes of the sewers,
hat of disguise, rust bag of tricks.  We even search the cemetery and
kill the ghosts and ghouls there (no loot, though).  3650/6.5 xp.

The umber hulk, however, turns out to have been tamed by the cultists
who had been sent to it for "punishment" (i.e., death), and they've been
waiting for a chance to get out of the place.  We offer to let them use
our house next to the quarry in Redlarch.