Finally made a reference for my character.
*Lumopony - species created by me. Ponies belonging to these species live deep underground and they have neither pegasi, nor unicorns only earth ponies. Primary differences from aboveground earth ponies - glowing tail and mane, and also much coarser body fur. These ponies descend from regular earth ponies, but going below the ground and living there for a long time, generation by generation their looks changed.
**Magic immunity - here I wanted to show off and because of that gave my OC immunity to spells that directly affect the character, that is he cannot be manipulated by telekinesis, changed by magic, affect his mind, heal wounds et cetera, so he won’t be affected by both negative and positive magic. According to story-history my character took part in a test of a new hard spell, created by local mages, which should have given him for some time ability to focus magic and allow flight, but the casters didn’t account for accidents and didn’t put up protection. During the spellcast an earthquake happened, which disrupted the ritual, nobody was hurt, but my character was unconscious for some time, and when he woke up he was told that spell was disrupted and now he’s impervious to magic.
I’ll go into details of what happened with my OC and how the species evolved later, when I’ll finish up the history.