The soul knight is a Warrior that split his soul into different parts, he can use this to his advantage, but it can be dangerous.

Warrior of many souls

Starting at 3th level you can split your soul into max. 10 pieces, for every split you lose 1 of your max hit points, at your turn the you roll one d10 for every soul, on a 10 you take a additional bonus action. Maximum of one.

Soul control

If you take a action one of your souls may dislike that action and force you to do something else, rol a d10.

1-5 you take the action like normal

6 if you have nine or 10 souls you cast eldrich blast, otherwise you take the action like normal.

7 if you have 7-10 souls you cast magic missile. otherwise you take the action like normal

8 if you have 5-10 souls you take make a number of unarmed strikes equal to you pb. otherwise you take the action like normal

9 if you have 3-10 souls you cast booming blade. otherwise you take the action like normal

10 you cast earth tremor.

Strengt or dexterity are your spell casting ability for these.

Soul sight

Starting at level 7 you can move one of your souls up to 60ft of your body and look and talk trough him, the soul is invisible and can be walked through. The soul can go through walls.

U can do this without a action pb times a long rest 

Soul attacks

Starting at 10th level you can attack as a bonus action trough your soul sight ability, the soul can only make unarmed strikes

Controled souls

If you must change your action to the demanding of one of your souls you can choose which of the 5 actions you pick, and you can choose to change the time you need for the changed action to a bonus action.

The number of extra bonus actions changes to 2

Ultimate souls

You can get all of your souls out of your body and use your action to let them all attack. You can do this 2 times a long rest