Okay your post isnt very clear so ill walk you through it.
Find one of the many man holes dotted around the temple district, theres one outside the temple of Talos. Head down go west until you meet up with some bandits, they are quite a tough group if you are a low level group so go around them if you must.
South of the bandits you mean a paladin called Keldorn, head into the tunnel near him. When you get into the new area you can go south or east, head east and then south, eventually you hae to fight your way out of a gas chamber trap, the trick is to send one person in to activate and run them out quickly.
Once you get through this you meet a priest called Gaal talk to him and ask him is there a way you could serve his god with out tearing out your eyes, hell give you a key to a locked chamber that was to the south when you first entered the area. Head over there, watch out for traps you meet these former followers who will help you with the quest, head past the grave and you get to these stairs, go down them.
Next your in a big cavern, fight your way to this busted temple where you have to click on the roof to solve riddles. The first answer is life I forget the second and the last answer is the current one, dont head straight over the bridge there are beholders, so scout it out and fireball them from the distance. Just upahead is the undercity temple area.
Oh and welcome to the forum.
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