Helm of Devil Command

The helm has 3 charges. As an action, you can
expend 1 charge to cast dominate monster
(save DC 21), which affects devils only. (The
spell fails and the charge is wasted if you target
any creature that's not a devil.) If a devil can see
you when you cast this spell on it, the devil knows
you tried to charm it. The helm regains all of its
charges 24 hours after its last charge is expended.