I currently can 2 key Nightmare but it takes 4 minimum for UN. The UN is inconsistent and i need to use the keys at specific times to ensure i get enough keys each day. I currently use ninja, geo, Elva autumn, Mithrala, and Nekhret the great. Im assuming that nekrhet is the weak link since hes not the best team defender and my ninja starts to die often after about halfway, needing to be revived constantly. what can i change to try and see more consistent results. i also added my frolni but i've heard he's not the best so im unsure whether he would be useful of not here. 

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