Song of Rest

Beginning at level 2, you can use soothing music
or oration to help revitalize your wounded allies
during a short rest. If you or friendly creatures
who can hear your performance regain hit points
at the end of the short rest by spending one or
more Hit Dice, each of those creatures regains an
extra 1d6 hit points.
The extra hit points increase to 1d8 at 9th level,
to 1d10 at 13th Level, and to 1d12 at 17th level.