Its simple really.......we kill the Cryptarch. Strange coins, motes of light, ascended materials.....anything but a rare from a purple. EDIT: Just got Crest of the Alpha Luppi from an exotic engram from the vendor. The cryptarch has somewhat redeemed himself. [spoiler] http://www.reddit.com/r/DestinyTheGame/comments/2gpvx6/statistics_we_decoded_590_engrams_here_are_the/ GREEN ENGRAM RARITY: White: 68 \ 23.45% Green: 201 \ 69.31% Blue: 21 \ 7.24% Purple: 0 Yellow: 0 BLUE ENGRAM RARITY: White: 0 Green: 53 \ 21.2% Blue: 186 \ 74.4% Purple: 11 \ 4.4% Yellow: 0 PURPLE ENGRAM RARITY: White: 0 Green: 2 \ 3.64% Blue: 33 \ 60% Purple: 19 \ 34.55% Yellow: 1 \ 1.82%[/spoiler]