Charisma (Willpower) (5e Skill)
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Willpower is the ability to resist, counter, or suppress a mental obstruction. A willpower check should be called for in the following scenarios: Forcing a telepathic message, possessing an unwilling subject, reading an unwilling person's thoughts, bypassing a psychic barrier, or doing something contrary to a magical command. The DC of a willpower check should get easier in the case of the last example, since the person making the check gets more used to resisting the magical command. In the other examples, the DC should increase, since the target's mind would get hardened against the psychic assault over time. A willpower check should be able to be countered with a Charisma or Wisdom saving throw, since willpower is about forcing your will on something.