Blood Hunter Initiate

You have spent time training in the ways of hemocraft. You gain a pool of 2 hemocraft die, which are d6s.

Blood Maledict. You know two blood curses of your choice. Each time you use your Blood Maledict feature, you choose which curse to invoke from the curses you know. While invoking a blood curse, but before it affects the target, you can choose to amplify the curse by taking necrotic damage equal to one roll of your hemocraft die. This damage can’t be reduced in any way. An amplified curse gains an additional effect, noted in the curse’s description. Creatures that do not have blood are immune to blood curses unless you have amplified the curse.

You can use this feature twice per short rest.

In addition, you gain the ability to cast the spell Hunter's Mark. When you encounter a creature that has handled your body parts, targeting that creature automatically upcasts the spell to 3rd level, making the duration up to 8 hours. 

If you encounter a creature that is in possession of one of your body parts, you can cause it to detonate, dealing 8d8 necrotic damage on a failed constitution saving throw or half as much on a success. The DC uses your spell save DC.

Blood Curse of Bloated Agony

As a bonus action, you curse a creature that you can see within 30 feet of you, causing its body to swell until the end of your next turn. For the duration, the creature has disadvantage on Strength checks and Dexterity checks, and takes 1d8 necrotic damage if it makes more than one attack during its turn.

Amplify. This curse lasts for 1 minute. The cursed creature can make a Constitution saving throw at the end of each of its turns, ending the curse on itself on a success.

Blood Curse of the Muddled Mind

As a bonus action, you curse a creature that you can see within 30 feet of you that is concentrating on a spell or using a feature that requires concentration. That creature has disadvantage on the next Constitution saving throw it makes to maintain concentration before the end of your next turn.

Amplify. The cursed creature has disadvantage on all Constitution saving throws made to maintain concentration until the end of your next turn.