The Crimson Lord

Some say the Crimson Lord is the first vampire, using avatars to feed his insatiable hunger. Your patron is as ancient as the oldest lineage flowing through the red river. The blood coursing through the veins of all living beings hold power that few learn to wield, save those who choose the crimson lord as a patron. His motivation is largely unknown, though the lust for blood can be felt in all who let him in.

Expanded Spell List

Your patron's power flows through your blood, granting you the ability to cast his spells.

The Crimson Lord Expanded Spell List 
1st Inflict Wounds | Ray of Sickness 
2nd Blindness/Deafness | Blur 
3rd Phantom Steed | Feign Death 
4th Greater Invisibility | Death Ward 
5th Mislead | Modify Memory

Charming Ichor

Your fit and charming body increases your maximum hit point by 1 per level you take in this class, as well as gaining proficiency in persuasion and deception.

Blood is Power

You are able to replace blood by infusing it with arcana energy that you may use later.

At 1st level, as a ritual that takes 1 minute, you sacrifice hp equal to double your warlock spell slot level to create an extra spell slot. You are able to create a maximum extra spell slots equal to your spell slot maximum. Your max hp is reduced by the amount used to create spell slots. 

These spell slots last until a long rest or when used, whichever happens first. The maximum hit points reduced by this ability is returned when the spell slots are all used up or on a long rest.

Blood Bond

At 6th level, when you are hit by an attack or damaging spell, you may use your reaction to sacrifice hit points up to the damage you have taken. For each hit point sacrificed, you deal triple of it as Force damage to the attacker. Once you use this feature, you must finish a short or long rest before you can use it again.

Blood Siphon

At 10th level, when you deal damage, you gain a number of hit points equal to your own constitution score. This can be used once a turn.

Sanguine Doctrine

At 14th level, you can use an action to transform into the Crimson Lord's servant for 1 hour, during this time:

-You gain true sight of 60ft.

-You become immune to fear and charm.

-You gain flying and swimming speed equal to your walking speed and no longer need to breathe.

When the transformation ends, you gain 1 point of exhaustion, unless your current hit points are higher than your natural maximum hit points. When your hit point reaches 0, you instead drop to 1 hit point, you gain a point of exhaustion and your transformation ends.