This Crossbow is made of dark hardwood and reinforced with a thick iron cage. There are delicate Engravings all along the metal cage and the stock of the bow is padded with a comfortable red leather rest. There is a large mechanical contraption with a slot at the top in the shape of a ring, as well as a needle that leads to a pool at the base of the neck. 
Attacks made with this weapon gain +3 to attack and damage rolls

This weapon consumes no ammunition for the next 5 + the number rolled on your last hemocraft die roll

While Attuned:

• Your walking speed increases by 10 feet
• You can use an action to cast Forcecage from it. After you cast the spell, roll a d6. On a roll of 5 or lower, you can't cast it again until the next dawn
• You have disadvantage on saving throws against spells.

Proficiency with a Heavy Crossbow allows you to add your proficiency bonus to the attack roll for any attack you make with it.

Notes: Bonus: Magic, Bonus: Speed (Walking), Requires Attunement by a Blood Hunter, Damage, Movement, Combat, Ammunition, Heavy, Loading, Range, Two-Handed, Push