Please help in making a Grim Hollow style transformation for Shade/Elemental Darkness

[Prince Vine]

Long breakdown ahead

Spoiler: Shadow Transformation

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Prerequisites
Ability Scores: Charisma 13
Roleplay: You must have made a been killed by a shadow, survived an extended time in the Shadowfell, or have some other plausible reason to have become a Shadow. Discuss with your DM how you can achieve this in-game.

Some of your abilities require your target to make a saving throw to resist their effects. The saving throw DC is calculated as follows:

Transformation Save DC = 8 + your proficiency bonus + your Charisma modifier

Transformation Level 1
Transformation Boon:
Shadow Sight
You can see normally in darkness, both magical and nonmagical, to a distance of 120 feet.

Transformation Boon:
Shadow Form
Your Dexterity score increases by 2 and your Charisma score increases by 1. An ability score cannot be increased beyond 16 this way. You become an Elemental in addition to any other creature types you are. Spells and abilities that affect Elementals of a specific CR have no effect on you.

Transformation Flaw:
Planar Binding
Your body and soul are bound to the Shadowfell. You have disadvantage on death saving throws as the plane attempts to pull you back to it. If you would be killed, your soul has been taken back to the Shadowfell. The Shadowfell is your new home, and you become an NPC under the DM’s control. If you are in the Shadowfell, this flaw has no effect.

Transformation Level 2
Starting at 2nd level, you can pick one of the following Transformation Boons. You also gain this level’s Transformation Flaw.

Transformation Boon:
Shadow Step
While in dim light or darkness you can use a bonus action to teleport to a space you can see that is also in dim light or darkness within 120 feet. You can this a number of times equal to your Charisma modifier (minimum of 1). You regain all uses of this feature when you finish a long rest.

Transformation Boon:
Blurred Edges
As a bonus action you can cause all attacks against you to be made with disadvantage until the end of your next turn. You can this a number of times equal to your Charisma modifier (minimum of 1). You regain all uses of this feature when you finish a long rest.

Transformation Flaw:
Hideous Appearance
Your appearance has grotesquely transformed. You become unnaturally pale, gaunt and translucent and radiate an aura of despair. Regardless of your true form, you’re horrific to behold. You can suspend this form and manifest the appearance of the humanoid you once were, but this is taxing and requires concentration. This form is not permanent, and moments of stress are likely to reveal your true nature. Your true form is revealed in the following situations:
• Concentrating on a spell.
• Gaining the unconscious condition.
• Entering hallowed ground.
• Choosing to reveal yourself.
In events of extreme emotional or physical stress, a GM may call for a Constitution saving throw with a DC of their choosing to see if you maintain your humanoid form. Non-evil creatures that witness your true form become instantly hostile to you, unless the DM decides otherwise.

Transformation Level 3
Starting at 3rd level, you can pick one of the following Transformation Boons. You also gain this level’s Transformation Flaw.

Transformation Boon:
Draw Darkness
When you start your turn in dim light or darkness, you regain 5 hit points.

Transformation Boon:
Meld With Shadows
You gain mastery of of the art of remaining unseen. You gain proficiency in Stealth. If you are already proficient in Stealth, then your proficiency bonus is doubled for ability checks using Stealth. If you have or ever gain double proficiency in Stealth you gain +2 to Stealth instead. Additionally, while in darkness you are invisible.

Transformation Flaw:
Light Sensitivity
You are vulnerable to radiant damage. If you start your turn in bright light you take 1d6 damage. While you are in bright light you have disadvantage on attack rolls and ability checks.

Transformation Level 4
Starting at 4th level, you can pick one of the following Transformation Boons. You also gain this level’s Transformation Flaw.

Transformation Boon:
Shadow Self
You become immune to poison and necrotic damage and resistant to cold damage as well as bludgeoning, piercing and slashing damage from non-magical weapons. In addition you cannot be charmed, frightened, paralyzed, or poisoned.

Transformation Boon:
Wield the Darkness
When you deal necrotic damage to a creature it takes an additional 2d6 necrotic damage. When you reduce a creature to 0 hit points with necrotic damage a shadow is created under your control. You can control a number of shadows equal to your Charisma modifier.

Transformation Flaw:
Glare of the Sun
While you are in bright you cannot take reactions or bonus actions, can only make one attack when you take the Attack action, and you have disadvantage on saving throws. All creatures in bright light have advantage against spells you cast.