Tier 10 refers to a set of class gear that is acquired from the tokens dropped in Icecrown Citadel. These sets are meant to be the third tier of raid gear for Wrath of the Lich King. Each set also has a 10-man, a 25-man and a Heroic version. Set bonuses are also shared among both sets. 10 man version is purchased from just emblems, the 25 man version is bought with turning in the 10 man version with a Sanctified mark that drops from certain boss in 25man Icecrown Citadel and Heroic can be gotten by turning in the 25man version with a Sanctified mark that drops from certain boss in 25man Heroic Icecrown Citadel.
The mark of sanctification are broken down into Conqueror, Protector and Vanquisher, which can be redeemed for gear by the following classes: