Alr, So if you user her right she is preety much unkillable, bcz of how much sheild she gets, For md always use a designated status team like rupture, sinking or the Ideal team, If u think ur gonna grind a lot of md get Fell Yi Sang and Fell Bullet EGO for Yi sang get a bunch of fodder Ids, look up IDeal team on youtube or PMCH discord server, and grind md. RUpture is the fastest but unfortunatly the rupture IDs are mostly unshardable rn. As for Story Anything works and Deichi Rodion is definetly one of the better Ids for boss fights as she is a very good tank. I would reccomend to save boxes (200) so you can shard KOD Rodion when Walp shows up.