@KappytheKing if you pray him enough you'll be immune to bullets and storm the area easily. I had about 500 believers left and I thought it was lost, but the Great Alien God saved our lives.
@stochastic there are always 2 switches, one next to the stairs (If you fall in a pit trap you could'nt go back without it), and a second one somewere in the dungeon (for me it has always been at the top lleft corner)
In the arcane tower, I was just out of an epic battle with 2 HP remaining. I was heading to the closest health fontain, just one portal to pass... Then I missclicked and stupidely walked on a fire glyph (T_T)
A great build for ranger : train focus, range, melee and fortitude until they're to 10, then max range. If you find a long sword, ugrade it all you can and buy every upgraded arrows you find in shop. Equip a maximum of mage items to increase your energy and try to find flying boots or ring of levitation as fast as you can, also try to find a staff. If you meet ennemies run until they're in line then destroy them with percing shot. If you're facing a strong or a lone ennemy just attack him with staff and when he's next to you kick him back with power shot (if you find a warrior/bearbarian book, learn some melee spells, it will be usefull). After the floor 13/14 start using all he good arrows you accumulated a just destroy ennemies with pering/powerfull shots (you should've find a lot of energy shrooms before you reach this zone, about 50 so don't hesitate to use spells)