Holy Veil is useful in some situations other hex removal skills are not, especially for runners. It can be cast ahead of time and removes a Hex without any activation time.
Recasting Holy Veil while it is still active will not remove a Hex.
Combined with Contemplation of Purity, at least two hexes and one condition can be removed from the caster simultaneously. This also adds Contemplation of Purity's heal effect and eliminates the awkward double-click requirement of Holy Veil.