Shadow Heart

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Soul Siphon

As a bonus action, you may siphon a portion of a creature's soul and use it to strengthen your own.  The target must succeed CON saving throw With a spell save equal to                        8+ Proficiency + CHA or have its STR score reduced by 1d4+1 whilst your strength score raises by half that amount 1 minute. Killing a creature while Soul Siphon is active resets its duration. If the target's STR score is reduced to 0, then its HP is immediately reduced to 0. You gain two uses of this ability per short rest. (Note that soul siphon charges CANNOT be stacked)

Dissolve

At 7th Level, you gain the ability to as a bonus action, use a creature's soul to step temporarily into the ethereal plane to safely escape harm. this ability lasts until the end of your turn.  You can move through other creatures and objects as if they were difficult terrain, as well as see and affect creatures and objects on the Ethereal Plane. You take 1d10 force damage if you end your turn inside an object. If you are inside an object when this feature ends, you are immediately shunted to the nearest unoccupied space that you can occupy and take force damage equal to twice the number of feet you moved. This feature lasts until the start of your next turn. You gain 2 uses of this ability. You regain uses of this ability on a short or long rest. You gain an additional 2 uses of this ability when you reach 10th level.

Consume

At 10th level, you gain the ability to expend a use of your Ethereal Dissolve as a bonus action to instead heal your physical wounds. You after expending a charge you may heal yourself by 2d6+4 if your HP is full at the time of use, this ability instead gives you temporary hit points equal to 1d6+4 instead.

Crown of Shadows

At 15th level you gain the ability to expend 2 charges of Dissolve/Consume to allow your shadow heart to temporarily consume you. Until the end of your next turn your attacks deal an extra 1d8 Necrotic damage, you gain 1d10+4 temporary hit points, and you gain +10ft movement speed.

Heart of Darkness

At 18th level you've learned to control all aspects of your shadowy heart. you gain 2 additional uses of Dissolve/Consume. Your Crown of Shadows state has now become the Crown of Darkness. Your Crown of Darkness costs 3 uses of your Dissolve/Consume and now lasts 1 minute. In addition, your attacks deal an extra 2d8 Necrotic damage, you gain 2d10+6 temporary hit point, and you gain an additional 15ft of movement.