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The Ninth Seal Contingency Array
wondrous item, legendary (requires attunement)
A circular brass lattice worn as a crown, collar, or integrated into armor. It hums faintly whenever powerful fiends are nearby.
Fiendish Resistance
You have advantage on saving throws against spells and effects cast by fiends.Contingency Seal Protocol
When a fiend you can see within 60 feet casts a spell or activates a teleportation or planar ability, you can use your reaction to trigger a seal response.The creature must succeed on a DC 18 Charisma saving throw or the effect is negated, and the creature is briefly bound by overlapping sigils until the end of its next turn. While bound, it is restrained and can’t take reactions.
If the negated spell or effect was 3rd level or higher, the target also takes radiant damage.
This reaction can be used once per short or long rest.

The Ninth Seal Contingency Array
wondrous item, legendary (requires attunement)
A circular brass lattice worn as a crown, collar, or integrated into armor. It hums faintly whenever powerful fiends are nearby.
Fiendish Resistance
You have advantage on saving throws against spells and effects cast by fiends.Contingency Seal Protocol
When a fiend you can see within 60 feet casts a spell or activates a teleportation or planar ability, you can use your reaction to trigger a seal response.The creature must succeed on a DC 18 Charisma saving throw or the effect is negated, and the creature is briefly bound by overlapping sigils until the end of its next turn. While bound, it is restrained and can’t take reactions.
If the negated spell or effect was 3rd level or higher, the target also takes radiant damage.
This reaction can be used once per short or long rest.