It is used to make Special Troops like Seeker, Lost ones, Reiter, etc. The below link might help you understand some part of the game.. still in construction..

http://plarium.com/forum/en/stormfall-age-of-war/game-tutorials/33598_beginner-guide-and-walkthrough-for-stormfall-2

peeter said:

Hi  . Who can advice . For what we can use maranian amulets ?

Try the Wiki and Help Files found in (?) top right corner of your game screen

http://prntscr.com/drless

http://wiki.plarium.com/index.php?title=Maranian_Amulets