Soul Stealer

You have been cursed with the power and hunger to take the souls of evil creatures.

This subclass specialises in psychic damage, mental defence, and gaining buffs from defeating creatures.

Consume

Starting from level 1, when you kill a creature of evil or chaotic alignment, you can choose to either gain temporary hit points equal to the creature's intelligence + wisdom modifier or deal damage equal to the dead creature's intelligence + wisdom modifier to another creature up to 30ft away from the consumed creature.

If the consumed creature's intelligence modifier is negative, it counts as 0, This is the same for Wisdom.

However, If you harm or kill a creature of good alignment, Unknowingly or not, you take psychic damage equal to your Level

Soulful Strike

at level 1, when you attack with a spell that does Psychic or thunder damage, you add +4 to the damage roll.

Transform Soul

Starting from level 6 and once per long rest, when you defeat an enemy, you gain an extra temporary spell slot of your highest level that lasts until your next long rest.

Soulful Mind

you have +1 on intelligence/wisdom/charisma saving throws and gain resistance against psychic damage.

Mind Fortress

Beginning at level 18, you gain another +1 to wisdom, intelligence, and charisma saving throws, and gain resistance to thunder and necrotic damage.