CHALLENGE AND EXPERT MODE ARE SEPARATE JOBS
SkillOne ladder, twenty-three skills. The experience table is the same for all of them.
RegionRank and friends are per region. We play on yours.
Account type
How it is delivered
Chambers of Xeric is an hour and scales with the party. Theatre of Blood needs five people who all know the fights, which is why it costs more than its length suggests. Tombs of Amascut scales with the invocation level you set, so expert mode is a separate row rather than the same run turned up.
Nobody can guarantee a unique from a raid, and anybody saying otherwise is describing a different game. What you are buying is the clear and the points, and what drops is what drops. If you want a specific item, the items page sells several of them directly.