ninja costume gives 1 block per turn and rogue helmet give a dodge per combat (its kinda like a consumable but it will refresh every combat). the strategy is to kill any extra attacks that your dodge can't prevent then your good to go, as long as you don't get one shot by an enemy you can get back to full health in 1 or 2 turns. the only bad opponents are spike, but as long as you have enough dodge you will never die so you can take your time.