Magic Resistance. The Valkyrie has advantage on saving throws against spells and other magical effects.
Multiattack. The Valkyrie makes two attacks with it's greatsword.
Greatsword. Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 12 (2d8 + 3) slashing damage.
Call of the Dead (Recharge 6). A 15-foot-radius pulse of negative energy extends out from the Valkyrie. The pulse spreads around corners. Each creature in that area must succeed on a DC 14 Constitution saving throw or become poisoned. While poisoned in this way, a target takes 5 (1d10) poison damage at the start of each of its turns. A target can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success. Emptying a vial of holy water on the target also ends the effect on it.
Stunning Scream (1/Day). The Valkyrie emits a horrific scream. Each creature within 20 feet of it that can hear it and that isn't a Valkyrie must succeed on a DC 14 Constitution saving throw or be stunned until the end of the Valkyrie's next turn.