On its own, being a user of Witchcraft has no inherent abilities. However, there are some abilities that interact with roles that are Witchcraft users. A Witchcraft user can be village aligned or evil.
Roles that check for Witchcraft
Items that check for Witchcraft
A common way for the Witchcraft check to be modified is by the Spellbound status. Some of the following uses this mechanic.
Roles that modify Witchcraft checks
Items that modify Witchcraft checks
Some roles and items interact with (or the lack thereof) Witchcraft users beyond identifying if they are a user or not. A notable example is The Inquisition which requires all Witchcraft users to be dead in order to win.