Armbrust vom Blutsauger

CrossBow that uses a syringe instead of an arrow that draws blood from the target on hit. After attuning, upon drawing the bow the syringe will automatically nock itself and a tube will feed up the arm, around the back, and into the back of the heart. If the attunement save failed, the user must make a DC 15 CON save or take 1d6 + PB piercing. This must be made each time the bow is drawn until the attunement save is a success. On a successful attunement save, the user is immune to this damage.

Upon finishing a long rest, you can choose whether the Armbrust von Blutsauger is a shortbow or a hand crossbow. Use the basic weapon stats for reference, except for extra damage as that will be outlined below

On hit, it deals base damage depending on its current form. It also deals an extra 1d6 + PB bleeding damage for 1d2 + CON rounds. If flipping a coin: heads is 2, tails is 1). You heal from the drawn blood, healing 2d10 + CON for the same number of rounds rolled for the bonus bleeding damage. The target must make a DC 15 CON save or be poisoned for 1d4 rounds.

References (remove the space, copy/paste):

Shortbow stat block 5e:
Damage: 1d6 piercing
Range: 80/120
Properties:
two-handed - A Two-Handed weapon requires two hands when you attack with it. Basically, you can't dual-wield nor use a shield while wielding a weapon with the two-handed property.
vex - If you hit a creature with this weapon and deal damage to the creature, you have Advantage on your next attack roll against that creature before the end of your next turn.

Hand Crossbow stat block 5e:
Damage: 1d6 piercing
Range: 30/120
Properties:
light - When you take the Attack action on your turn and attack with a Light weapon, you can make one extra attack as a Bonus Action later on the same turn. That extra attack must be made with a different Light weapon, and you don’t add your ability modifier to the extra attack’s damage unless that modifier is negative.
loading - You can fire only one piece of ammunition from a Loading weapon when you use an action, a Bonus Action, or a Reaction to fire it, regardless of the number of attacks you can normally make.
vex - If you hit a creature with this weapon and deal damage to the creature, you have Advantage on your next attack roll against that creature before the end of your next turn.

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

Notes: DC 16 CON save to successfully attune without consequent saves. Can be made every short rest., Ammunition, Range, Two-Handed, Vex