To consume a corpse in Diablo 4, use a skill that consumes corpses to trigger effects. As for getting corpses, kill enemies or use the Hewed Flesh passive to gain a chance of damage dropping corpses.
Anthea Levi is a registered dietitian (RD) and reporter with more than 6 years of experience writing for major health outlets including Health magazine, BuzzFeed, Eat This, Not That!, and Livestrong.