Boon of Nightmares

Your nightmares manifest in reality and enhance you with powers of darkness.  You gain the Devil's Sight Eldritch Invocation.  You also gain the Nightmare's Embrace ability as described below.  Once Nightmare's Embrace is used in this way, it cannot be used again until after a short or long rest.

 

Nightmare's Embrace.  You may as an action on your turn gain the following benefits for a duration of one minute:

 

Umbral Veil.  A region of darkness emanates from you, causing a feeling of dread in anyone within it.  For the duration, you manifest a sphere of magical darkness as described in the spell Darkness, centered on yourself.  Umbral Veil does not require concentration.  Any spell or effect which can dispell the spell Darkness will also and in the same manner cause Umbral Veil to end; however, in this case, all other effects of Nightmare's Embrace continue for the duration.

 

Twin Shadow Blades.  A fell divine influence twists the Weave to bend the rules of magic beyond what mortal sorcery allows.  If you know the spell Shadow Blade as well as the Twinned Spell metamagic, you may at any point for the duration spend the appropriate resources to apply Twinned Spell to Shadow Blade to create two shadow blades as described in the spell; in particular, Twin Shadow Blades requires concentration.  If one or both shadow blades dissipates, you may use your bonus action to cause both shadow blades to reappear with one shadow blade in each hand.

 

Manifesting nightmares in this way is damaging to your spirit.  At the end of each of your turns for the duration of Nightmare's Embrace, you take 1d6 psychic damage which cannot be reduced in any way.  You may end Nightmare's Embrace as an action on your turn.