Roget's 21st Century Thesaurus, Third Edition Copyright Â© 2013 by the Philip Lief Group.
Keystone Credit Recovery offers students two ways to complete credit recovery units: online or through correspondence. Students enrolling in online courses receive an email with instructions on how to access their courses.
Rift Keystones (or RKs) are small objects that drop randomly or are awarded for completing all five bounties in a given Act in Adventure Mode. RKs have no function on their own and are only useful to open up a Nephalem Rift.