|Calder Cob is a concept which has only appeared in an adaptation of the works of J.R.R. Tolkien.|
Calder Cob is a character created specifically for The Lord of the Rings Online.
Calder is a citizen of Archet and a traitor. He aligns himself with the Blackwolds and gives them information on their defenses. His plans are found out by Jon Brackenbrook, but Jon is unable to convince his father, the Captain of Archet, because it was Calder who imprisoned Otto, the former leader of the brigands that attacked Archet. Dirk Mudbrick, with aid of the player, can finally convince Captain Brackenbrook that Calder is a traitor, but it's already to late. 
Calder was sent off to prison, but he and Otto were freed in the Assault of Archet and kill his jailor during the attack.