Add coriander through pepper to a small bowl. Mix spices well. Add chicken legs to a slow cooker one layer at a time. Once the bottom of the slow cooker has a layer of chicken legs sprinkle the spice mixture liberally until covered. Add another layer and repeat with spice mixture. Add your third layer and sprinkle with remaining spice mixture. Cover with slow cooker lid and cook on low heat for 4-5 hours (mine cooked in 4 1/2 hours but every slow cooker is different so check doneness after 4 hours).