A few areas I've noticed don't have flagged as sewers even though they'd most likely be considered such. I'm basing this off of the Ooze Savant perk buff that should appear in those areas.
I'll update the thread as I find them.
- One in particular stands out: the Acid Tomb from the "Oozing Delight of the Tomb" quest, where seemingly another Ooze Savant NPC dwelled and worked. If anywhere should have the Savant perk active, I think it'd be there, heh.
- I also recall a grate that appeared in ring 100 which lead to a 'Drips' zone with a few rats and chests which didn't grant the buff. I don't recall the name since it was a day one thing I noticed (sorry).
- [Will update with more!]