Calder Rook
Original campaign-world reference. Sections describing the supplied Day 17 instance record that playthrough only; possibilities remain possibilities.
Role: Person connected to Wayfarer and old-network history. World lore: Calder is distinct from the Hook. He was being watched, but the source does not establish by whom, for how long, or whether he knew. His knowledge overlaps imperfectly with others connected to Edren's past; he is not an all-knowing guide to the network.
Day 17 instance: The continuum names Calder as important and says his current status and location should be confirmed before he re-enters a scene. No accepted encounter or further personal history is provided. Being watched does not itself establish Hook membership, hostility, or knowledge of Edren's credential. The name is rendered Calder Rook in both sources.
Sources: creation helper, Vale/Taren/Mara/Calder; campaign continuum, important NPCs; campaign continuum, open threads.