The Sibilant Death

In the last years before the yuan-ti empire collapsed, Sseth appeared to the serpent folk in the form of a winged yuan-ti. He promised to lead the yuan-ti away from the brink of defeat and back to the pinnacle of world domination in return for their veneration. Many of Merrshaulk’s devout turned to the worship of the Sibilant Death, believing him to be an avatar of their deity. They granted him enough power to mount a brief recovery, but those actions were too little and too late to prevent the collapse of the empire. Sseth chose to rest and gather strength during the years of decline, as more and more of the yuan-ti adopted his worship.

His most devout followers, known as mind whisperers, use their god-given magic to emulate Sseth’s tactics and principles. They strive to succeed by offering an alternative choice to contesting viewpoints or plans, and in so doing they exude an air of self-importance that gives them a less than savory reputation among yuan-ti that follow other gods.

Sibilant Death expanded spells list

The following spells are added to the warlock spell list for you.

1 - Identify, Tenser's Floating Disk

2 - Augury, Silence

3 - Leomund's Tiny Hut, Phantom Steed

4 - Divination, Dominate Monster

5 - Commune, Rary's Telepathic Bond

Serpent's Fangs

At 1st level, you gain the ability to add an extra bite to your spells. When you hit a creature with a spell attack, you may add an additional 2d4 to the damage rolls for that attack. This extra damage increases to 2d6 at 5th level, 2d8 at 10th level, and 2d10 at 15th level. You may do this a number of times per day equal to your Charisma modifier. You regain these uses when you finish a short or long rest.

Slithering Rites

At 6th level, you become so infused with magical energy that spells cost little to your physical form.

As an ability granted to you by your patron, you can cast any spell you know as a ritual, even if the spell doesn't have the "ritual" tag. When a spell is cast this way, a spell slot is not expended, as described with the ritual spell traits in the PHB.

Additionally, you can spend one long rest to perform Slithering Rites. By doing this, you can swap any number of spells you know with others on the warlock spell list for no additional cost. However, these rites require that you sit idle, meditating and communing with your patron as a short rest. No spells can be cast upon you for the duration and any spells that were cast upon you at the start of the short rest are dispelled if they are active within 30 feet of you. If your body is disturbed in any way, whether physically or mentally, the rites end. You are considered incapacitated in this state. You cannot gain the benefits of this feature again until the following dawn.

Tainted Gifts

Starting at 10th level, you are capable of accessing the more unnatural magic of your patron. You can once per long rest summon a cauldron for 1 hour. If you make a soup by placing this cauldron above a bonfire and boiling the flesh of a creature you have killed for 10 minutes you transform the contents of the cauldron into five servings of a dark red liquid. Anyone who drinks this liquid can choose to gain advantage on any saving throw until its next long rest. Whenever a creature chooses to gain advantage on a saving throw this way it becomes poisoned until the end of its next turn.

Serpent's Armor

Starting at 14th level, your skin mottles into scales granting you +5 natural armor. Your new scaly skin also makes you resistant to bludgeoning, slashing, and piercing weapon attacks. You lose the benefit of this class ability if you wear armor although you may still use a shield.