Refrain is a limited CE only available in Kara no Kyoukai (The Garden of Sinners) event.
For the duration of "Kara no Kyoukai (The Garden of Sinners) event", this craft essence gains additional effects.
Work in progress...
Rashoumon event (Ibaraki Douji event)
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Inheritance of Glory
5 Star Servants Tier List: Best Servants [5/9 updated!]
Best Servants [★4]: 4 Star Tier List
Sorcery Ore
Saint Martha
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Caster
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Final Destination