Divine Sentinel

You conjure a spiritual sentinel in an unoccupied space that you can see within range, where it remains for the duration. The sentinel appears as the creature or object depicted by the onyx sculpture that you use to cast this spell, but it cannot be larger than a medium creature. As a bonus action, you may move the sentinel a number of feet equal to ten times your spellcasting ability modifier on each of your subsequent turns while maintaining concentration on this spell. 

When any creature within five feet of the sentinel makes an attack roll, casts a spell that deals damage, or moves out of the sentinel's range, you may use your reaction to cause the sentinel to strike the attacking creature. Make a melee spell attack roll, on a hit, the target takes 4d10 radiant damage. If a creature was casting a spell when they're hit by the sentinel, it must make a concentration check in order to finish the incantation. On a failure, its spell fails and the spell slot is lost.

At Higher Levels: When you cast this spell using a spell slot of 6th level or higher, the damage increases by 1d10 for each slot level above 5th.

"I'll protect you, always." 

- A fallen soldier, fourteen hours pre-death