Tweaking your character's abilities can help you get that extra edge in battle. Unlike the Orb Reset, the Rune Shard is for minor adjustments to your character's build; With it you can take 5 orbs away from one attribute that has at least 10 orbs and redistribute them how you see fit.
How to Use
Log in with the character you wish to use this on. Type /store in chat or press "0" and choose the coin icon to bring up the in game store. Find Rune Shard in the list and press the "use" button which can be found at the bottom of the store. This will remove all armor and gear you are wearing and place it in your backpack. Press "E" to bring up your character screen and place the orbs where you'd like.