You bind your wounds and rest a bit before loading up on treasure and moving on. The remaining rooms to the south have all been cleared of creatures - some random debris on the floor makes you think they left in haste. Sure enough, when you get to the catacomb entrance (#19)
it is ajar and tracks lead out, down the hill and into the wilderness.So I think we'll call it there - you've defeated the source of evil and the citizens of Grimmsgate will no longer be afraid to venture away from town. You'll be hailed as local heroes, and have secured some nice bits of magic and a treasure hoard - that last one gives you each about 500gp.
Here is the full map: