Anima resources
Build an initial crystal reserve
A small Anima Crystal reserve gives you room to open a useful Chaos mission tier after completing the story.
Chaos mission selection; use Light of Possibility if it is unlocked and its level is manageable.
Repeat the accessible mission while you need crystals. Any first-clear bonus is limited to the first completion; ordinary clear rewards are the repeatable part.
Stop once the reserve covers your next planned unlock, then test that mission. Return to crystal farming only if another level or mission is worth opening.
Open a guide to find other locations and see what the item is used for.
A small Anima Crystal reserve gives you room to open a useful Chaos mission tier after completing the story.