Sangromancy spells

Blood Bond
3rd-level enchantment (sangromancy)
Casting Time: 1 action
Range: Touch
Components: V, S, M (a rag soaked in your own blood)
Duration: 1 hour
As part of casting this spell, you must expend three
hit dice or the spell automatically fails. If you do, roll
the expended hit dice, and the creature gains an equal
number of temporary hit points.
For the duration of the spell, you know the direction
and distance to the creature at all times, you and
the creature can speak to one another telepathically
(provided the creature has an intelligence score of 3 or
higher), and you can target the creature with spells you
cast that have a range of Self or Touch. These benefits
are suppressed while you and the creature are not on the
same plane.
At any point, a creature affected by this spell can
choose to end the spell early. If it does, the creature loses
all remaining temporary hit points granted by this spell
and takes necrotic damage equal to the temporary hit
points lost.
At Higher Levels. When you cast this spell using a
spell slot of 5th or 6th level, its duration is 8 hours. When
you cast this spell using a spell slot of 7th or 8th level,
its duration is 24 hours. When you cast this spell using a
spell slot of 9th level, its duration is 7 days.