So I've got a player in my campaign whose character, of chaotic neutral alignment and level 16, has been in search of a magical mount. After much research ingame, the character has grown an obsession for Nightmares.
Their story arch is bringing them to the Fire plane soon because of a city known for its magical beast/ servant trade there. Story-wise, there's no reason why she wouldn't be able to find one for purchase and begin negotiations. As the DM, I have no problem at all with this and actually promote the creative way of obtaining one.
My only question is how this may affect her, or if the nightmare will/won't serve her.
All I've been able to find regarding this has been tips like this one from realmshelps.net:
Nightmare, Lesser: A nightmare is a horselike creature of evil; a good-aligned owner who makes an investment in a lesser nightmare soon discovers that the mount does not serve him and escapes at the first opportunity. Lesser nightmares are bred from their more powerful brethren. Not as headstrong or as capable of traveling between the planes at will, a lesser nightmare still can carry its passenger into other dimensions.
She for sure isn't a good-aligned character, but isn't evil either.
Can a non-evil character realistically have a nightmare as a mount?