Ah, saturday morning here so I have time
I got within 1 shot twice. Here are the cliff notes, save all your health potions for the boss, save a couple of strength potions for the boss, there is one randomly selected monster class - if it's rogues leave the dungeon, there'll be a poison ward in one of the shops - be lucky and find it early. Save your wall breaking charges for errosive or corrosive plants and just take poison on the chin.