The basement

Down the stairs, this next room contains six statues flanking a path which leads directly to an elegantly ordained pool of water.

Statues:
Upon stepping into the room, the statues glow red and release fiends to guard this chamber. 3 bearded devils and 3 bulezau are summoned and attack immediately. For this reason, the cultists always avoided this room as they had lost too many of their own to it.

Pool of Water:
The pool of water is dark and dephless, it goes on as far as the eye can see and seems to swallow light within it. You can feel an alien force calling you within.
The water leads down to an immense underground chamber of water. If Azra'iel gazes into it, he must succeed a DC 16 wisdom saving throw or leap into the water.

Underwater chamber:
As you swim down into the depths, you can feel this immense emptiness around you. Alien lights seem to glimmer in the distance, giving sign of habitation. Still you are drawn deeper into the waters. A rush of water informs you that you are not alone as something massive swims around you. Three yellow eyes, one on top of another, open and give you a glance at the enormous creature you face. 
Within this chamber, the aboleth Grinara makes his lair with his 4 merrow servants. They attack any creature that tries to pass through it. Grinara is an aboleth with 207 hit points. He is enslaved by Cerathor to test the mettle of any who would think to serve him. Anyone in the chamber can see faint light coming from a hole in the bottom of the room
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