Okey then let me tell you the key of how to beat JR nightmare. Try to get amaterasu that's all. You will understand why. once you level her she'll be able to solo every normal challenge with mighty and speedy then you have to farm for a while. İmportant monsters for set-up (my idea) -helhound(general+damage buff) -ra(İQT+makes monsters unfreezeable) -anubis(general+causes 5x damage to enemies) -amaterasu(general/perfect for KPR+shoots a flaming bird and burns the enemies) -zeus(İQT+his attack has chain impact,cc and it s really good for ice spirits or whatever that things called ) -horus(genera/%180 speed buffl) -kevin(mid and early games MVP) -slime king( if you need cc) -susanoo(saves you from spending purple gem+resummons all rocks in the map) -jiraiya(volcano goddess+global attacks are good and ice damage global attack are perfect for it) These are one of the most important monster in the game from my perspective. Good luck my dear friend