Compassion: Interlinked

A magical interlinking of psyche is realized between the caster and a consenting creature. Drops of each other's blood are conjoined as medium for painting a symbol (e.g. a circle with two perpendicular lines intersecting) on the caster which temporarily burns into the skin. While the symbol lasts, the caster transfers 1d4 + constitution modifier of their max hp to the target, and an additional 1 + constitution modifier for every hit die sacrificed to a maximum amount of dice equal to half your level rounded up. Hit dice that are sacrificed are expended until the caster completes a long rest.

This spell requires the material component even when cast ritually.