Avacyn - Silver Collar

Avacyn engaged each demon in single combat, defeating them one by one. She found that new demons would appear a short time later and decreed: "What cannot be destroyed must be bound." She then forged a collar of silver to bind demonkind, so they could be hauled away and imprisoned. The Silver Collar became Avacyn's symbol and the holy symbol carried by Avacynian priests and cathars.

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THE PRISON OF SILVER