Warlock Pact Boon: Pact of the Blood

This pact boon allows you to convert the primordial power of blood into raw magical energy. As a bonus action on your turn you may expend some of your own hit points in order to cast a Warlock spell without expending a spell slot, the number of hit points expended equal 5X the level of the Warlock spell you wish to cast, reducing your hit point maximum by that amount until you finish your next long rest. The spell's casting time initiates after you use this feature as a bonus action.

Using this feature you cannot cast a spell of a higher level than your highest castable Warlock spell slot. You may only use this feature a number of times equal to your proficiency bonus per long rest.

Pact of the Blood Invocations

Bloodsense

Prerequisite: Pact of the Blood

You can sense the presence and general direction of any creature (apart from constructs and elementals) below its hit point maximum within a 120ft radius of yourself.

Vicious Vitality

Prerequisite: 9th level, Pact of the Blood

When you are below half of your hit point maximum you can reroll 1’s on cantrip damage dice.

Cauterize

Prerequisite: 12th level, Pact of the Blood

When you are below half of your hit point maximum all slashing, and piercing damage dealt to you is reduced by your Charisma Modifier.