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 free. Players who practice movement and timing in a CoD BO7 Bot Lobby will find the steps easier to learn, but you can also do this on a normal run...