Shattered Soul

your soul is fractured and barely held together using the souls of others while literally fighting your inner monster

Soul Siphon

Beginning when you choose this archetype at 3rd level, You gain the ability to use another person's soul to temporarily mend your own to make sure you don't go savage

Beast

You let the monster empower you with strength and rage.

 

As you level up, you will be able to harness more of it's power.

Partially Undead

You gain the benefits and weaknesses of an undead.

 

resistance to poison and necrotic damage

advantage against charmed and frightened conditions.

Health Siphon

at level 10, you can siphon health but lose the ability to siphon their soul.

Beast Abilities

You get to choose two abilities to use while in beast form.

Beast Magic

Use the beast's energy to cast.

Beast Weapon

Conjure beast energy into a single weapon accustomed to your own beast.

Pure Strength

Use the pure animalistic power of the beast.

Control

At 18th level, you attain one of three benefits depending on what you choose.

You also no longer need to siphon souls but can still do so if you choose.

Beast

The beast takes control. You use the full strength of the beast but you're always in beast form and easily angered.

Both

Regardless of if it's out of begrudging respect, survival, or actual care, the person and the beast learn to coexist.

The person

The person is in control.