The Drowned City
From HGWiki
See Ssithrak Dimension
Waterbreathing is required to survive here!
This area gives you your first taste of Ssithraks, there are four Ssithraks that will drop Gems on this map which you MUST collect to access the Ssithrak dimension. They are required to open the portal in The Translation Chamber. They respawn after about 30 minutes if you miss one although it is probably quicker to jump to another server if this is the case.
Whilst this is not a fugue area for immortal characters the Ssithraks can hit very hard and it can be a chastening experience for newly immortal characters especially if they are poorly equipped.
Rest Spawn Chance
Zero