Dragonbane

This double-sided blade is made of red-hued iron and is engraved with Draconic runes that glow crimson when near a true dragon. The hilt is made of blackened iron and wrapped with red silver wire, the pommel shaped like the head of a red dragon.

This family greatsword is the property of Lord Pemberton. The scabbard was lost decades ago in Brockendale Castle when the Pembertons’ ancestors fled. Since then most believe it to be a family legend—a colorful story, but nothing more.

You gain a +2 bonus to attack and damage rolls made with this greatsword. When used against a dragon, you instead gain a +3 bonus to attack and damage rolls, and deal an extra 3d6 slashing damage. When the blade scores a critical hit against a dragon, the dragon head on its pommel glows with fury, dealing an extra 3d10 radiant damage.

Additionally, you have advantage on saving throws made to resist the attacks and traits of dragons (including breath weapons, roars, and even spells if a dragon can cast them).