Heliana's Guide to Monster Hunting, pg. 502
2nd ring Arcane, Necromancy
You touch a creature, absorbing the energy from its body and bolstering your metabolism. Make a melee spell attack against a creature you can reach. On a hit, the target takes 5d6 cold damage and can’t take reactions until the end of its next turn. In addition, until the end of its next turn, its speed is reduced by 15 feet and your speed is increased by 15 feet.