Finally managed to work out how to get to Volcano Manor (lol, once you know it's easy but figuring it out took me way longer than it should have - /shakes fist at visiting areas at night - I missed a ladder in the dark).
While in Volcano Manor, I noticed a door that can't be opened, went poking around, found an illusory wall that eventually led me to a new underground area that I had not heard of / read about anywhere* (Lost Prison or something), and am now busy exploring that

- I love areas that have rooftops to explore.
* I used a guide for the early game 'cos I just found it too hard to gear up properly as a mage in the early game. Since hitting Altus, I only use a guide for specific hints if I'm really really stuck
