Iv seem a lot of ppl who already got theirs relic wepons to +1...

Since i got mine yesterday, now i am wondering how to get my Sphairai to Sphairai+1?

I v already been told that i need 900 points of Mytology to exchenge for 3 itens and that i should give that itens to some npc, but i dun know where it is...

Can anyboady help me out?