Unicorn of Friendship

A Large spectral unicorn appears and hovers for the duration in an unoccupied space of your choice that you can see within range. The unicorn occupies that space and is indistinct except for a gleaming horn and armor emblazoned with the symbol of friendship(A pink star with 6 points).

Any creature hostile to you that moves to a space within 20 feet of the unicorn for the first time on a turn must succeed on a Dexterity saving throw. The creature takes 25 radiant damage on a failed save, or half as much damage on a successful one. The guardian vanishes when it has dealt a total of 75 damage.