How would anyone find that he/she has any unusual ability?
There are two nations (called Priests of metals and Desert people) that have men and women gifted with very unusual* abilities of handling of magic.
As those abilities are very powerful, only some people of both nations have that gift.
But how (in which way) should they find that they have that gift?
* for example they:
- see magic as colourful air (not as air coloured by chemicals)
- feel magic as living one awared of good and evil (life and death - but merciful death is accepted as good)
- be anywhere where is any shadow
- can go walk between two places with one step regardless of their distance
and some ones also:
- can change themselves into pure magic (only in self-defence or in direct defence of anyone else)
- can make magic to move them to any place (different from striding through shadows or walking between places with one step)
These abilities are really very unusual - because common abilities are about classical spells (that are very limited in my world - attack spells are not available).