Talk:FGO Summer 2018 Event (US)/@comment-33276611-20180726180357

It's because of 3 rate up servants: 3% + 70% + 33%. Wait for each servant rate up to change the last chance to 100%, thus it will be 2.1% for desired servant. 4* servant always has 3% drop rate and 5* always 1%. But specific servant always has even lower change because rate up is never 100%.