Calm's Crystal Cobra

Holding the chosen gem in your hand, you point to an unoccupied space within range. From that point springs a large, shimmering snake-like construct.

The cobra has the statistics of a Giant Constrictor Snake, but with an AC of 15. The cobra acts on your turn and obeys your mental commands while you are within 300 feet of it(not action required.) If you do not issue any commands then it will defend itself from hostile creatures, but otherwise will take no actions.

The cobra crumbles into a sparkling dust before fading away when the spell ends, but if the cobra drops to 0 hit points, it explodes in a dazzling array of shattered light and crystal. When this happens, each creature within 5 feet of the construct must make a dexterity saving throw. A creature takes 2d6 Piercing damage and 1d6 Force damage on a failed save, or half as much on a successful one. A creature grappled by the Cobra at this time automatically fails this save.