Notes

the tattoo integrates with the wearer along with blood magic: As a bonus action, you can empower the tattoo for 1 minute. For the duration, each of your melee attacks with a weapon or an unarmed strike can reach a target up to 15 feet away from you, as bloody tendrils launch toward the target. In addition, your melee attacks deal an extra hemocraft die (1d8 at 11 blood hunter lvl (1d10 at 17 blood hunter lvl)

(Recharge 7-8). You concentrate on transferring the blood in your body to the tattoo.
roll a hemocraft die and if that roll's outcome is 7 or 8 the tatoo is recharged, u can recharge ur tatto 2 times with this way. second time u recharge ur tatoo after its duration finish u get penalty to your max hp, discard every hemocraft die outcome u roll to your max hp till long rest

Blood imbued strikes: While the tattoo is on your skin, your unarmed strikes are considered magical for the purpose of overcoming immunity and resistance to nonmagical attacks, and you gain a +2 bonus to attack and damage rolls with unarmed strikes.