To swallow objects, powers and people
Swallowing is the powerful ability to consume objects, powers and people whole. It allows users to consume anything that comes into contact with them, allowing them to use the consumed for sustenance or to transport the object or person to another location.
The Slime Demon could swallow people whole to feed off their magic. It unsuccessfully tried this three times on Phoebe, Chris and Wyatt Halliwell. It later succeeded in swallowing Penny Halliwell while it was feeding on the Nexus.