Soul Warden

The Soul Warden subclass delves deep into the mysteries of shadows and their ancient powers. Warriors who follow this path are adept at summoning shadowy allies to aid them in battle, drawing upon the darkness to enhance their own combat abilities. They are skilled in navigating dimly lit environments and can seamlessly blend into the shadows, making them elusive and deadly opponents. Legends speak of Shadow Warriors who have mastered the art of shadow manipulation, becoming fearsome adversaries feared by both mortal and supernatural foes alike.

 

This is my take on sung jin woo's shadow monarch from solo leveling, enjoy. 
I will be changing names and descriptions to match more dnd lore, than solo leveling as I play test this subclass.

Spellcasting

You have learned to cast spells.

Cantrips. You know three cantrips of your choice from the Wizard spell list.

Whenever you gain a Rogue level, you can replace one of your cantrips with another Wizard cantrip of your choice.

When you reach Rogue level 10, you learn another Wizard cantrip of your choice.

Spell Slots. The Soul Warden Spellcasting table shows how many spell slots you have to cast your level 1+ spells. You regain all expended spell slots when you finish a Long Rest.

Soul Warden Spellcasting

		—Spell Slots per Spell Level—
Rogue Level	Prepared Spells	1	2	3	4
3	3	2	—	—	—
4	4	3	—	—	—
5	4	3	—	—	—
6	4	3	—	—	—
7	5	4	2	—	—
8	6	4	2	—	—
9	6	4	2	—	—
10	7	4	3	—	—
11	8	4	3	—	—
12	8	4	3	—	—
13	9	4	3	2	—
14	10	4	3	2	—
15	10	4	3	2	—
16	11	4	3	3	—
17	11	4	3	3	—
18	11	4	3	3	—
19	12	4	3	3	1
20	13	4	3	3	1

Prepared Spells of Level 1+. You prepare the list of level 1+ spells that are available for you to cast with this feature. To start, choose three level 1 Wizard spells.

The number of spells on your list increases as you gain Rogue levels, as shown in the Prepared Spells column of the Soul Warden Spellcasting table. Whenever that number increases, choose additional Wizard spells until the number of spells on your list matches the number in the Soul Warden Spellcasting table. The chosen spells must be of a level for which you have spell slots. For example, if you’re a level 7 Rogue, your list of prepared spells can include five Wizard spells of level 1 or 2 in any combination.

Changing Your Prepared Spells. Whenever you gain a Rogue level, you can replace one spell on your list with another Wizard spell for which you have spell slots.

Spellcasting Ability. Intelligence is your spellcasting ability for your Wizard spells.

Spellcasting Focus. You can use an Arcane Focus as a Spellcasting Focus for your Wizard spells.

Shadow Extraction

When a hostile creature is reduced to 0 hit points, you can use a bonus action to attempt to extract its shadow. The difficulty of the extraction is determined by the target creature's Challenge Rating (CR). You have a maximum of 3 attempts to extract a shadow from each creature. The shadows extracted are stored within you, you can then store a number of shadows equal to your Sneak Attack die plus your Proficiency Bonus.

The shadow is an exact shadow of its former self. It has all the same characteristics and gear (if applicable) the creature had on its person in life. You are able to give each humanoid shadow a single weapon and a single piece of gear.

Successful Extraction: To successfully extract a shadow, make an Intelligence (INT) plus proficiency bonus check with a DC determined by the target creature's Challenge Rating (CR) as follows:

CR 1-4: DC 10

CR 5-9: DC 15

CR 10-14: DC 20

CR 15-19: DC 25

CR 20-24: DC 30

CR 25-29: DC 35 (level 19 requirement)

CR 30: DC 35 (level 20 requirement)

Shadow Summoning

You gain the ability to summon shadowy manifestations to aid you in combat. As an action, you can summon a shadow soldier to fight alongside you. The shadow soldier lasts until dismissed, and it follows your verbal commands.

The number of shadow soldiers you can have summoned at once is equal to your Sneak Attack die count.

Each soldier can take one action at the cost of one Sneak Attack die per shadow summon.

Each summoned shadow has a base stat block (see below). Each shadow uses a d6 for damage rolls, unless the attack, spell, or ability says to use a d4. You can modify HP and AC to better resemble your shadow.

Shadow Summon Stat Block

Shadow Sense

You can now extend your senses to your shadows. Through your shadows you can see, hear, and communicate with creatures in range of the shadow. As long as the shadow is on the same plane of existence as you, you can use this feature.

Shadow Step

You gain the ability to step from one shadow to another as a bonus action. When you are in dim light or darkness, you can teleport up to 30 feet to an unoccupied space that is also in dim light or darkness. This ability enhances your mobility and strategic positioning in combat.

Enhanced Shadow Servants

Your shadow soldiers gain additional abilities and enhancements, making them more formidable in combat. Choose one of the following options to enhance your shadow soldiers:

Shadow Resilience

Your shadow soldiers gain temporary hit points equal to your proficiency bonus at the start of each of their turns, making them more durable in battle.

Shadow Veil

Your shadow soldiers gain advantage on Stealth checks while in dim light or darkness, making them more effective at ambushing and staying hidden.

Shadows Grace

You can sacrifice one of your shadows for it to heal a creature it can touch for 1d6 points.

Shadow's Embrace

You can tap into the power of the Shadow Monarch, transforming partially into a shadowy form. As an action, you can gain the following benefits for 5 minutes: - Resistance to non-magical bludgeoning, piercing, and slashing damage. - Advantage on Dexterity saving throws. - Once per turn, when you hit a creature with a weapon attack, you can deal extra necrotic damage equal to your fighter level. You can use this feature a number of times equal to your Dexterity modifier (a minimum of once), regaining expended uses after finishing a long rest. This transformation into the Shadow Monarch enhances your combat abilities and survivability.