The Forbidden Temple Part 2

We woke to find Himo had come down with some sickness from a poison from the mold on the wall we passed the day before. We had to go back that way to turn off the force fields, so Umlilo cast a warding wind to get us by to the control room. Geode worked on the console and when he turned off the field, we were attacked by shadowy spirits including a large troll.
 
The troll dropped Geode in the fight and had a big back and forth with Mule. Geode once again had to interact with the pedestal, which he said control was being partially blocked by a malevolent source of whom's lair we were in. He was able to drop the force field after which we moved back past the now burnt mold and rested to recover from the fight.
 
We returned to the blocked doorway, flanked by snake figure carvings, a grand staircase rose ahead which shimmered with geothermal gases. Despite my warning, Mule moved through the gas and passed out at the same time Umlilo set the gases on fire. At the top of the stairs, warded portals stood to either side. When Himo threw a rock into the northern portal it was thrown back with force.
 
We pressed forward, through a general evil feeling which seems to be allowing us by but could stop us if it wanted to. We found an illusory wall and moved to investigate which ended in another illusory wall. Beyond that, there was several giant mummies on thrones. It felt like a museum, and Himo was able to determine that these were cloud giants corpses. Umlilo then was able to determine the mummified remains were phylacteries of a lich, one that was quite insane.
 
We headed south through a huge chamber and found that more mummies existed on the other side of the hall. Tom found a hidden passage that headed west and we headed in that direction. As we were looking around we heard in our mind 'Welcome, I've been expecting you.' The lich suggested that she could help us and beckoned us to her.
 
We found a giant floating skull with emerald eyes and teeth attended to by lizardfolk children. She said we were wise to leave the skull behind and that we would need her help to overthrow the Yuan-Ti. Her name is Niaketh.
 
She offered to aid us in discovering the true name of one of the artifacts on the condition that we return it to her lair and release the Merilith and defeat it, allowing her to absorb the powers of the fiend and transcend to the next level of being as an arcane being. We would then be free to leave her lair.
 
The party voted to agree to Niaketh's agreement. She let us know that the Ancient Black Dragon, KRAVAXXORA, had bespelled us to forget, which she broke. It was to her that we need to go to determine the name of the Merilith in the artifact.
 
We returned the child we came to rescue to the village, much to their awe. We were feasted for our success.