Nemesis are way too hard to get. there should be an event about their stories That rewards one of their forms of your choice. for example, "the hunt for voltaik" for faraday, "Vengeance" for samael, and "Crash landing" for talos. they should be ten battle stages long, each challenging, but not Impossible. also,they should have a Replayable "Hard mode"To get cells to Rank them up. also, this should be a free event, like heroic dungeons, and open to all levels (Not like the heroic dungeons). of course, special temporary battle teams that fit the story should be provided, like the test battles.