To counter The_kracken_777's comment, I thought the Dusk Troll was perfect, when one appears you really have to consider if you even want to fight it. DNGNCRWL is based on an OSR style game, you're not meant to be able to defeat everything you come across, retreating is always a viable tactic.. If you want an easier fight, iItems are your friend, as bombs, scrolls and poison dont give a foe a chance to counterattack.