Force drain/Legends

Force Drain was the dark side equivalent of Force Healing, the difference being that the user drained the target's Force reserves to fuel the regenerative process, or to replenish their own strength in the Force. Greater aptitude allowed exceptional drainage speed and the ability to drain multiple people at once. Darth Traya was a master of this insidious power and used it to quickly kill her enemies. A very few (possibly Darth Nihilus alone) have taken this ability to such heights that they can feed on entire worlds at a time. Emperor Palpatine fed off the inhabitants of his retreat world of Byss collectively with his Dark Side adepts. It has been suggested by some that Darth Vader inadvertently killed his own wife, Padm%C3%A9 Amidala through this power, in an attempt to keep himself alive following his extensive injuries on Mustafar.