When do you move on from the first dungeon?

[Lucifer]

Is there a boss at the end ?

[steve2727]

No boss IIRC, you 'complete' the Sewers by finding out the information you need to enter the Catacombs. In terms of a good level to move on from the Sewers, in the original game I always used the '3 levels per dungeon' rule of thumb, go in the Cellar at level 3, sewers at level 6, catacombs level 9, castle level 12. Seems to be holding up in the remake so far (but I'm only in the sewers myself)

[Yido]

Steve is right, That is a good rule of thumb indeed..

My personal preference is having my 2 magic users level 7 spells for Magician and Conjurer (level 13)
And then retrain into a Sorcerer at least spell level 3 (level 5) because of the magic eye that detects stuff, As thier are more special things and traps in the Catacombs.
After Catacombs you should have 1 magic user in Wizard mid spell level as there is alot of monsters in catacombs to farm XP on to progress your levels quicker.
In Catacombs level 1 i farmed the Zombies (2 battles) and then left and came back And I'd say after each fight id level up. Works well! (wait till Catacombs level 2!!! lol)
Good luck!

[Balkin]

Most of this game is one large puzzle, search for info, collect info, use info to take down bad guy!!