Pact of the Aliktetheme

When the great curse happened, not only did it empower the natural forces of evil in the world, but it brought forth new, wordless powers of unfathomable strength. For one reason or another, these powers were given the name "Aliktetheme." An Aliktetheme is capable of granting additional strength at a severe cost, though it is unknown what an Aliktetheme gains in return, as they are either incapable of speech, or just refuse to.

Expanded Spell List

At first level the Aliktetheme proffers a vast wellspring of spells to choose from as it attempts to entwine your form with the weave itself. You are given access to the Sorcerer spell list when choosing your Warlock spells.

Aliktetheme's Grace

An Aliktetheme grants you the ability to surpass your spellcasting limits at the price of depleting your energy. After you have run out of any and all spell slots - whether they are granted from this class or another - you are able to cast spells equal to the same level as your Pact Magic spell slot, incurring one level of exhaustion whenever you do so. Levels of exhaustion gained in this way can only be reduced by taking a long rest. Additionally, all levels of exhaustion gained through this feature will be reduced to 0 after a long rest, instead of reducing your exhaustion by 1 level.

Fleeting Vitality

Your connection to the Aliktetheme has filled you with an energy that you can feel fleeting from you almost as fast as as it can invigorate you - it's almost uncomfortable. Starting at 6th level, whenever you take damage you may choose to expend one use of Fleeting Vitality to gain temporary HP equal to half the damage taken which will last until the start of your next turn.
You have a number of uses equal to your proficiency modifier, and regain all spent uses after a long rest.

Resilience Through Strain

Your strong will has paid off, and you are able to resist overexertion to a certain degree. Starting at 10th level, taking 6 levels of exhaustion will no longer kill you, instead, you fall unconscious for 8 hours.
Additionally, you have advantage on Constitution saving throws to resist exhaustion.

Aliktetheme's Voice

The Aliktetheme deems you worthy enough to bestow upon you it's most valuable weapon: it's voice. You may choose one or more targets you can see and speak a command word to it that reverberates in their mind - the effects of which are detailed below. The target does not need to hear you, or understand any language for this feature to work.

Vanish: Target(s) must succeed on a CON save or be Blinded for the duration.
Yield: Target(s) must succeed on an INT save or be Charmed by you for the duration.
Dread: Target(s) must succeed on a STR save or be Frightened of you for the duration.
Fall: Target(s) must succeed on a WIS save or be Prone and Restrained for the duration.

On a failed save, the target(s) take 8d8 Psychic damage, and succumb to the condition(s) associated with the word spoken, which lasts for 1 minute, as if you were concentrating on a spell. On a successful save, they take half damage and suffer no other effects. The target(s) can repeat the saving throw to end the effect at the end of their turn.

For every target that fails the saving throw, you must make a CON saving throw against your Spell Save DC, taking 1 Level of Exhaustion on a failure.