How to Get a Free Wisp Tea Perk in BO7 Zombies

Perks change the way you play in Call of Duty Black Ops 7 Zombies. The Wisp Tea perk is one of the best freebies on Vandorn Farm. The perk normally costs a lot of Essence, but a simple map sequence called the Ghastly Waltz can hand you Wisp Tea for f...