I feel confused about that.
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I feel confused about that.
The various summon types listed are the result of DMM aigis having so many premium units that they decided to break things into smaller pools so players have a chance of getting what they are rolling for. I'm not certain of the specifics as I don't play on DMM, but premium is the standard summoning, which I think they removed old units from, Revival is a summoning pool of older units that are no longer in premium, pickup is a summon pool with only a few platinums and blacks selected around a theme, imperial is limited to imperial units (a large category relating to some abilities and the story of later events). I would suspect that farewell might be a gacha for units that are leaving the normal premium pool.