UNDERSIGIL
This area, which is purely optional, lies hidden under Clerk's Ward and has some extra tough monsters. It is basically an arena and a change if you should become bored with the peaceful quests of Act 5. Just remember to store up on healing charms before you enter; you're going to need them!
Map Key
Plus ... A: Monsters!
What to Look for
If you thought you'd put together a pretty tough team, think again, cutter! This area is simply crawling with extra tough monsters. You will meet Trelons, Larval Worms and a single Sohmien. You will also find some minor treasure.
Once you have cleared the area, you can go back up and down again, and you will find that the monsters have respawned. Thus, Undersigil is an endless source of battle experience.
At 1 you can ascend back to Clerk's Ward.
At 2 you will find a dead body with a Heart Charm on it.
The chest at 3 contains Shackles of Light, which can be used to invoke "Chain Lightning Storm".
The area at 4 has several containers with:
Open the door into 5 to find a solitary Sohmien for you to kill.
The cupboards at 6 contain:
The containers in the area around 7 contain:
Finally, the areas marked with A on the map are the places where you will encounter monsters the first time you enter Undersigil. After that it is more random where you find the opposition. But don't worry, they will be here waiting for you. ;-)