J is for Justuscias

I couldn't find a good demon for J from the Dictionaire Inernal, so I'm using a different demon (Amduscias) and just changing his name to a J one.

Justicias is a grand and formidable duke of Hell. His natural form is that of a unicorn, but he can transform into a man/unicorn hybrid if  he wishes. He often uses his natural form to frolic in the mortal realm with virginal women. While ultimately evil like his brethren, he never harms the maidens and takes special care of his favorites (though this care can be brutal to those that disrespect or harm his ladies). He can command musical instruments to play on their own. He can his music to bed trees and summon familiars. Again despite his evil nature, he is on friendly terms with many nature deities and fae lords.

Justusias
Armor Class: 3 [16]
Hit Dice: 9
Attack: Gore (1d6)
Special: See Below
Move: 15
HDE:  11, 1,700

Justicias is immune to nonmagical weapons. On the mortal plane he will always be encountered with a group of natural animals (often bears, wolves, or great cats). His horn can cure any disease and heal grievous injuries.

Summoning/Bargaining Ritual Modifiers: Occultist is a virginal maiden (+5), Charisma 15+ (+1), Occultist is male (-5)

Potential Boons: service of an animal companion, ability to play musical instrument, healing

Potential Banes: occultist grows a unicorn horn, occultist must become celibate or immediately be sent to the infernal realm of Justusias, lowered maximum HP