There are 3 soul shards to get in the game.  They are not easy to get.
Want to have them now?  Well, ok...here you go.

This is the Soul Shard of the Winged Horror.  Once placed, hold F on it and you will get the 2 Hour buff.  Great for when you go out boss hunting.  Be prapared, granny always said.
 
- Increases Silver [Resistance] and Fire Resistance by 50, Spell Power by 10[,] and Spell Critical Strike Rate by 5%.