Visit Skuld's reputation store through the Gate of Mustafa.
As long as you finish the story quests after level 91 and gain enough reputation from them, you can buy rare items or skills from the store.

Show Quest Info

Introduction

The Goddesses of Fate feel that everyone who is willing to revive Odin should gain rewards. Goddess Skuld prepared a shop. As long as you finish the story quests after level 91 and gain enough reputation from them, you could buy rare items or skills from the store.

NPC Dialog

The Eldest Goddess of Fate prepared a store for warriors. It has rare items and some special skills. There will be more rare goods available the more highly the Goddesses regard you.

Quest Completion

I guess Mina has told you already. These goods could be purchased with enough reputation and Goddess' Tears.