Black and White Daggers (Variant)

Weapon (dagger), rare (requires attunement)

These matched daggers are identical except for the stones set into their pommels. One pommel is chalcedony (opaque white), the other is obsidian (opaque black). The white dagger is +1 versus monstrosities, the black dagger is +1 versus undead. If both daggers hit the same monstrosity or undead creature in a single turn, that creature takes an additional 1d6 piercing damage from the second attack.

Note: A later sourcebook features a more powerful item with the same name. This is in the wiki as Black and White Daggers