Water or Blood
Hidden beneath the ocean, and protected by strange magics, with the only known access through ancient human sacrifice portals, and swarming with drowned undead.
There is a magic dome holding up the waters above fish and sea creatures visible through it. The city seems abandoned at first, but investigation will reveal that it is teeming with undead. The treasures of the city remain in place, presumably including some Umarian red clay.
the Main known portal was smashed and destroyed when Kyros (along with Isonar and Jenar) betrayed and left behind Ur’run and the single platoon with him and his adjuncts.