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Collaborations are special events done in partnership with content from another game or other source. These generally include units that can only be summoned during the event as well as special event quests which are often required to access equipment or gear for those units. If you obtain a collaboration unit you should make sure to get any event specific equipment or gear required for the unit before the event ends, as they do not always return and the items are often required to unlock the full potential of the unit.