Name--- Dark Heart (cursed charcoal demon)
Every year a new black charcoal stone grows where her heart would be
She gives her charcoal heart to Santa to deliver its chunks to only the worse kids of the year
The coal chunks contain a curse
Misbehaving reindeer are rumored to be traded to her once a year, as payment for the stone
Santa always brings her a new comfy deer skin coat every year as a gift to trade for the Dark coal heart
She's not a bad demon, and the forest animals love her, she chases away the bad spirits

250$---Death Ash form
300$--- extra art
400$--- neat outfit (maybe cloak look)
500$--- Tentacle fun time
600$--- dragon or feral form
700$+-- more art