User blog comment:Rulebladeraysawa/Why trinity force isnt "core" on GP/@comment-4834593-20120831210034/@comment-3974211-20120901052847

Sheen is a more reliable "crit" than an actual crit early game, that's the only reason people get it. I think you've calculated Parrrley's damage wrong.

120 base damage + 246 attack damage + 162 sheen damage? Critical strike damage on skills applies only the to the attack damage/add bonus AD scaling. +100% base, +50% ie, and 10% mastery. The damage is 120 + 639.6 + 162 = 921.