Matron's Jeweled Amulet

Trinket equipment — Rare

Your Gemborn Matrons instead have, "Deploy - This deals damage to target opposing champion or troop equal to the number of socketed troops in play."

Changes: Gemborn Matron
Slot: Trinket
Rarity: Rare
Set: Frost Ring Arena
How obtained: Frost Ring Arena

What it does is the game's own text; how it was obtained is from the owner's records.