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All Artifacts can be used as Off-Piece.
So please don't just strongbox every artifact just because Paimon says so, especially double crit pieces.
Already upgraded artifacts can be used to create Sanctifying Elixir.
Try to get a 1:2 Ratio of Crit-Rate to Crit-Damage. So sometimes when you have enough Crit-Rate on your substats or weapon, the Crit-Damage Circlet can be the better option.
Have fun strongboxing and may your pieces roll on good stats.