You can bring the vessel back to the room with the dais. There is also a hidden cache in one of the spiderwebs along the walls of this chamber.
You can get CladhalĂath without fighting her but you do not get the additional enchantments. The only way to get the soul vessel is to kill Nridek. ( Benevolent 2 and Grieving Mother will both provide additional dialogue here.) If you offer peace, Nridek leaves. You will come into a chamber that houses Nridek, the spider queen, a vithrack who seems to be capable of some telepathic communication.
Proceed down the hallway and around the corner. Let the onrushing spiders trigger it for you while you reverse in-place. Use caution: your party's marching order will be reversed, and there is a poison gas trap immediately behind you. Pass through the tunnel if you haven't already, and you'll be transported to a hallway.
Go to Woodend Plains and speak to the Giantslayers adventuring group near the southern end of the area, on a small rise with a wagon on it.If you side with The Dozens, you have access to the quest The Bronze Beneath the Lake, and you should go to that page for a complete walkthrough (note that the lower floor will remain flooded until the end of Act II, so you will not be able to access it during this quest.) You can come across this space in two ways, depending on whose side you choose in Defiance Bay. Depending on what time of year an expedition party sets out for Lle a Rhemen, they may find an impressive arrangement of stone, or nothing at all. Since the basin sits near the broad end of Stormwall Gorge, the site is subject to flooding from heavy seasonal rainfall. This makes Lle a Rhemen a site of enduring interest to ambitious animancers. Locals have suggested that magical rituals were conducted there long before Aedyrans even put their history to paper. This circle of standing stones at the bottom of a deep, marshy basin has proven a deadly attraction for explorers. The ruins lie beyond Dyrford on fringes of Glanfathan territory. The lower level appears to have been used as a sacrificial pit, with grimy, corroded skeletons lining the floor of the vat. Lle a Rhemen or "the Place of Bindings" was an Engwithan animantic facility, focused on crafting powerful soul-bound weapons using white adra.