Trying to remember...

[Subigo]

Hello SFF lovers,

I am kind of going crazy the last couple of weeks trying to remember a story i read a while back.

I dont remember a lot, mostly the beginning.
its about a boy, goat herder, the goats eat a sort crystallized plant that makes the coat incredibly hard. The boy becomes a soldier, his grandpa makes him a set of armor from the goat hair.
He moves up in the army becoming a leader.

I vaguely recollect there being some plot about a sort of ubermensch ruling the planet (probably invaders from another time/planet but that is unknown to the inhabitants of the planet) This last part might have come from an other book altogether.

Sorry about the incoherent rambling, really all i recall at the moment. Any help would be greatly appreciated.

Kind regards,
Subigo

[suciul]

The only book I know of that sounds even remotely similar to the above is Crystal Cosmos by Rhys Hughes

[Farragut]

It sounds a little bit like L. E. Modesitt, Jr.'s Corean Chronicles (the first book is Legacies).

[Subigo]

The corean chronicles.
As soon as I saw the name I knew it was what I was looking for.
Thank you both!