The forgotten serpent V2

Followers of the god can commune with snakes, use stronger negative energy, and heretic magic.

Heretic Magic

Heretic magic can only be gifted by this patron and to those deemed worthy. Heretic magic attacks the soul of a being but takes a price to do. Using heretic magic costs life energy and curses the user with a mark of heresy. There are only three spells in this set.

Soul tear: deals 1d8 necrotic at 1st level, 2d8 at 5th, and 3d8 at 9th

Heretics smite: deals 1d10 necrotic at 1st level, 2d10 at 5th, and 3d10 at 9th

dissolution:  deals 2d12 necrotic at 1st level, 4d12 at 5th, and 6d12 at 9th

Mark of Heresy

Mark of Heresy stores lifeforce in order to use Heretic magic. depending on level of the spell is how damage is calculated.

for example: using Dissolution while at 1st level will deduct 2D12 point of necrotic damage to either the stored HP or directly to the users HP.

The mark can absorb the life of the user to be used instead of their current HP but if there isn't enough life force stored and the user tries to use heretic magic the user loses control and recklessly uses the spells at the cost of their own life. User must make a wisdom save  of 15 or go into a rage. User makes wisdom saves at the beginning of each round while enraged. The mark can store up to 80 HP worth of life force. 

Serpents fervor

Being aligned with Heranima you gain resistance to necrotic and posion damages. Aswell gain an affinity for snakes being able to cast the find familiar spell but only summoning serpents.

resistance

your patrons energy flowing through you has made you resistant to necrotic and poison damage types.

Heranima's aura

Using Heranima's aura lets you use one heretic magic without taking damage. This also puts Heranima's aura making enemies around you within 10 ft frightened on a failed save and on a succesful save unabke to be frightebed by you. This skill can only be used once per long rest until level 15 then rises to twice per long rest.

Godslayer

Heranima's follower calls out the great heretic to devour and destroy the soul of their enemies. This ability can only be used once per long rest then twice at level 20.