If you cast a spell that creates an undead, which kind of energy are you tapping into?

@mikemearls @ChrisPerkinsDnD If you cast a spell that creates an undead, which kind of energy (Positive or Negative) are you tapping into?

— Ariel Cardillo (@CardilloAriel) July 7, 2017

Undead are created by tapping into the Negative Energy plane. #WOTCstaff https://t.co/bvv6Y3BOHn

— Christopher Perkins (@ChrisPerkinsDnD) July 7, 2017