Aspect of the Serpent

You summon the spiritual aspect of a serpent to coil unseen around your hunt—growing more potent when your quarry is marked by Hunter’s Mark or when you fight upon the spirit’s favored terrain.

Base Effect. Advantage on Dexterity (Stealth) checks and on saves against poison damage and the poisoned condition.
Hunter’s Mark. First hit each turn against marked target deals +1d6 poison damage.
Favored Terrain. (Swamp, Desert, Forest) You may move through difficult terrain without penalty.

At Higher Levels. When cast using a 3rd- or 4th-level spell slot: The duration increases to 1 hour. When cast using a 5th-level spell slot or higher: The duration increases to 8 hours.