The Serpent God

Your patron is a god or being with a strong affinity to snakes. They are vile and cautious beings, often wanting to see the yuan-ti grow in power and might again. Keep in mind that they believe that humanoids, and even the lower castes, are disposable if this means a greater yuan-ti survives. The three main serpent gods are Dendar, Merrshaulk and Sseth, but there exist a lot more, although not as powerful as the main three.

Expanded Spell List

The three snakes lets you choose from an expanded list of spells when you learn a warlock spell. The following spells are added to the warlock spell list for you.

Serpent Expanded Spells

SPELL LEVEL	SPELLS
1st	animal friendship, command
2nd	animal messenger, suggestion
3rd	bestow curse, spirit guardians
4th	dominate beast, giant insect
5th	insect plague, dominate person

Snake Corruption

Starting at 1st level, your patron has gifted you with great understanding over snakes. Through sounds and gestures, you can communicate simple ideas with snakes. Additionally, whenever you make a Charisma check when interacting with snakes or snake-likes (Yuan-Ti, etc.) your proficiency bonus is doubled if it applies to the check.

Lastly, your eyes gain a slight reptilian look and your tongue becomes forked. Only yuan-ti will notice these changes, making them treat you like a purebrood.

Patron's cunning

Mind Whisperer

Starting at 1st level, when you reduce a hostile creature to 0 hit points, you gain temporary hit points equal to your Charisma modifier + your warlock level (minimum of 1).

Nightmare Speaker

Dendar has given you the power to invoke nightmares. As an action, you can tap into the nightmares of a creature you can see within 60 feet of you and create an illusory, immobile manifestation of the target's deepest fears, visible only to that creature. The target must make a Intelligence saving throw against your spell save DC. On a failed save, the target takes 1d10 psychic damage and is frightened of the manifestation, believing it to be real. You must concentrate to maintain the illusion (as if concentrating on a spell), which lasts for up to 1 minute and can't be harmed. The target can repeat the saving throw at the end of each of its turns, ending the illusion on a success, or taking 1d10 psychic damage on a failure.

You must finish a short or long rest before you can use this feature again

Pit Master

Merrshaulk has learned you how to put other creatures in a deep slumber. As an action, you target up to five creatures that you can see within 60 feet of you. Each target must succeed on a Constitution saving throw against your spell save DC or fall into a magical sleep and be unconscious for 10 minutes. A sleeping target awakens if it takes damage or if someone uses an action to shake or slap it awake. This magical sleep has no effect on a creature immune to being charmed.

You must finish a short or long rest before you can use this feature again.

Snake Body

Beginning at 10th level, the amount of snake blood coursing through your body has made you immune to poison and the poisoned condition. Additionally, you can shed your skin as a bonus action to free itself from a grapple, shackles, or other restraints. If you spend 1 minute eating your shed skin, you regains hit points equal to 2 times your Charisma modifier + your warlock level. You must finish a long rest before you can use this feature again

Ophidiophobia Aura

Starting at 14th level, you can invoke a strong fear for snakes in someone. As an action, you can target any number of creatures other than a snake or a yuan-ti within 30 feet of you. These creatures must make a Wisdom saving throw against your spell save DC or become frightened of snakes and yuan-ti for 1 minute. You can decide if the targets see you as a yuan-ti or not. A frightened target can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success.

Once you used this feature, you can't use it again until you finish a long rest.