plisnithus8
Adventurer
We tried, but the drow drove us off. We came back after a rest, and were again driven back. The GM later told us that we would need to be around 5th level to have a reasonable chance of success to defeat the drow guarding the prison. We instead went a different direction and ended up in one of the Underdark towns. Once I calculated how much gold it would take to make a new spellbook, I got the GM's permission to retire my character and make a new one.
But you don't need to defeat the drow, just find a way to get your stuff back.
As s DM, I try to avoid commentary like telling you at what level you'd need to be to defeat something, and if the demons could be a distraction as you escaped, your DM could have easily ssid they came again as you were stealthing back in (maybe you could find snother distraction).
A significant number of drow could be away (looking for escaped prisoners) and/or you bribe a guard, enlist an NPC prisoner, find a drow with a grudge; maybe one of the drow out looking for you decided to carry the spell book with her.