As of right now I'm not sure what you have to kill to collect the orbs. I will update once I find out, however the npc should tell you enough information to be able to do this quest.
- Location: Farstead Keep
- Reward: Blue Crystalline Ring
- Difficulty: Easy
- Part 1: Travel to Farstead Keep and speak with Talrych Athain.
- Part 2: Collect 12 Crystal Orbs and return to Talrych Athain for your reward. Receive Blue Crystalline Ring