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Description:
Twilight tries to help
Derpibooru costs over $25 a day to operate - help support us financially!
Description:
The age of the injury shouldn't make a difference with respect to attaching a prosthesis (though it might for healing magic/alchemy). It'd be cool to have Tempest get one, come up againast some villain, and then dramatically yank the thing off to unleash her signature magic blasts.
If humans can make cochlear implants and prosthetic limbs, magical ponies can make prosthetic horns. Though, if the injury is as old as Tempest's, there might not be much to salvage. Besides, she seems happy with her fireworks.