fb7d1f71__Walkthrough_by_metzomagic_com__Why_and_How
[Who] Loghaire Thunder Stone [Where] Wheel Clan [Why and How] 
First you need to talk to him about the Stone and the Shape, and convince him to return to rule his clan. Second, you need to find out the fate of the Black Mountain Clan. Loghaire will then join you regardless of your follower limit, and he's a formidable Melee fighter.
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Why and How