Choosing the correct Special Ability crystal for the Interlude additions.
The top A-grade weapons added in Interlude require stage-12 Soul Crystals for their Special Abilities. The crystal color selects an option specific to the weapon. Examples include Sirra's Blade, Naga Storm and Daimon Crystal. Their weapon components and 60% recipes are associated with Primeval Isle quests. This rule is specific to these additions; it is not a universal crystal requirement for every A-grade weapon.
For Daimon Crystal, Acumen requires a green stage-12 Soul Crystal. Other colors select different abilities.
Daimon Crystal’s green stage-12 Acumen requirement is useful only for that weapon. Compare other candidates by their own SA options and ingredient list. In particular, the general C-grade-and-higher SA system allows weapon-specific choices; a crystal bought for one named weapon should not be assumed to provide the same effect on another.