Venom Blast

Serpentine fang is weak compared to magical power, but one can inspire the other.

You gesture to summon an etheric serpent at a point within range and command the beast to release a deadly poison. Creatures in a 15-foot radius from the serpent must make a Constitution saving throw. If it fails, the creature is poisoned within a minute and takes 6d6 poison damage. If it is successful, the creature takes half the damage and is not poisoned. A creature poisoned by this spell can repeat its saving throw at the end of each of its turns, ending on a success.

At higher levels: When you cast this spell using a spell slot 4th level or higher, poison damage increases by 1d6 per slot level above 3rd.