Block rating was number typically appearing on items that improved your chance to block an attack. Some abilities, enchantments, items and spells could contribute bonus block rating also (the bonus spell usually has the name "Improved Blocking" or "Increased Block X"). At level 80, players require 16.4 block rating to gain 1% block chance.[citation needed] Block rating is not to be confused with "block value" which — prior to the Cataclysm expansion — increased the amount blocked (damage mitigation) each time a block occured, rather than affect the chance for a block to occur.