Taegen

Father of Rinn.
Was once a member of The Church of Purity. At some point he discovered something that alarmed or concerned him, and became one of the founders of The Purity Defenders.
Eventually he left The Purity Defenders, and, according to Lady Merith, was going to tell The Empire of Sand about The Church of Purity.
Lady Merith believes an entity she knows as The Darkness killed him. The Party believes (based on description) that this is [Lord Devon.