As a Poison Spray 5E spell you do extend your hand toward one creature which you can able to see within a range and also project a puff of noxious gas from your palm. So the creature should succeed on a Constitution saving throw or take 1d12 poison damage.
At Higher Levels:
Actually, this d&d 5e Poison Spray spell damage would actually increase by 1d12 whenever you reach at 5th level (2d12), 11th level (3d12), 17th level (4d12).
Attributes Of Poison Spray
| Casting Time | 1 action |
| Classes | Druid, Sorcerer, Warlock, Wizard |
| Components | V S |
| Damage | 1d12 |
| Damage Type | Poison |
| Duration | Instantaneous |
| Level | 0 |
| Name | Poison Spray |
| Range | 10 feet |
| Save | Constitution |
| School | Conjuration |
| Target | A creature you can see within range |