Str 18 (+4) Dex 18 (+4) Con 14 (+2) Int 10 Wis 10 Cha 4(-3) PB+3 (goes up every 5 levels)
Skills: Acrobatics +7, Athletics +7 Stealth +7 (goes up with PB)
50 HP Immune to poison, disease, sleep and charm effects.
If it "dies" it just goes back to the Astral Plane and heals ready for your next short rest.
Can go invisible PB/ SR
Attacks: All attacks considered magical
Bite: +7 to hit, D4+4 damage. Con save 10+PB or 2d6+4 Poison damage
Constrict: dex 10+PB or grappled and restrained. While grappling the snake has advantage on bite attacks or it can crush: Str save or 2d6+4 bludgeoning.
The snake can be used as a whip using a bonus action:
2D8 +4 Radiant damage and you can either use the poison from the bite or constrict. Obviously you must let go off the snake to constrict.
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