He said don't dismantle it because it all adds up to the new Light level system, but they made it clear infuse is only a year two feature.
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I took it to mean that only year 2 items can be upgraded. Not just only year 2 items can be used for sacrificing as well.
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you can only use year two items, when he upgraded the Suros, only year two weapons where shown to apply, even though he had year one weapons on.