Society of the Stygian Seal

A lanky figure, his face little more than a constellation of stars under his hooded cloak, floats amid candle smoke coalescing into translucent, bestial spirits. The figure's hands each have two figures and a thumb extended as it summons the Vestiges of past heroes. This is the cover image of the Complete Binder.

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Initiates to the Society of the Stygian Seal learn the story of Erebus, The Shadow Interminable, a vestige of singular age, profound implication, and terrible portent. She is a vestige inextricably linked to the creation and destruction of the multiverse, the latter of which is prophesied to be heralded by her sign, the Stygian Seal, being fixed in the sky for forty days and nights before the multiverse is to be unraveled. Initiates of the Society seek Erebus’s sign and the ritual means to draw her true form from the Void to hasten the end of the multiverse—and by extension, the coming of a new, more perfect world, uncorrupted by the shortfalls and compromises made by the primeval gods of our multiverse. By drawing parts of the Stygian Seal, binders of the Society can pull forth voidstuff, a manifest absence in space, and shape it to their whims.

Voidsight

At 3rd level, you gain darkvision out to a range of 60 feet. If you already have darkvision from another source, its range increases by 30 feet.

Tenebrous Initiate

Starting at 3rd level, you can bend the walls of the universe, creating small rifts into the Void. Once on each of your turns when you hit a hostile creature with a melee attack, you can teleport 5 feet to an unoccupied space you can see.

Oblivion Exile

At 7th level, you can use your action to cause a creature you can see within 60 feet of you to make a Charisma saving throw against your vestige save DC; a creature can choose to fail this saving throw if it wishes. On a failed save, the creature is banished into an endless sable demiplane adjacent to the Void. While there, the target is incapacitated. At the start of your next turn, the target reappears in the space it left or in the nearest unoccupied space if that space is occupied.
Once you use this feature, you can’t use it again until you finish a short or long rest.

Ritual of the Aegis

Starting at 10th level, you can perform a special ritual over the course of 10 minutes, shrouding yourself in plates of voidstuff, which act as ablative armor. You gain temporary hit points equal to your binder level + your Charisma modifier. While you have these hit points, your AC equals 10 + your Dexterity modifier + your Charisma modifier.

Stygian Sanctuary

Beginning at 14th level, Erebus whisks you away to the Void, rather than subjecting you to death. When you take damage, but aren’t reduced to 0 hit points or killed outright, you can use your reaction to teleport yourself to an endless demiplane adjacent to the Void. You remain in this plane as long as you wish, and can use your action to return to the space you left or the nearest unoccupied space if that space is occupied.