Hey Kamikazees, Your guide really inspire me. I have whip out my "giant stick" more often lol.
However, I disagree on the enemies to target first in sewer.
First for the bandits hideout and stronghold. The sewer Mage should be the first priority to kill as they spam heal like no tomorrow! Even if you target bird, before the bird gets killed, the Mage proli would have healed it first. However, I'll try your theory killing the birds while on staff.
As for goblins. Def target those goblin Mage first as you can freeze those melee goblin and you won't get damaged from them as long as you keep your distance.