In the Age of Triumph reveal stream there was a Milestone called "Outlandish Arms" stating "Exotic Weapons Collected......... X/55" Here's my Theory. There are 50 Year 2 Exotics(including Iron Gjallarhorn, Abbadon, Vigor Mortis, Fabian Strategy, First Curse, Tlaloc, Ace of Spades, Thorn, Khvostov 7G-0X, Outbreak Prime & Ice Breaker), with Vex Mythoclast as 51, (presumably) Necrochasm as 52 & (hopefully) Pocket Infinity at 53. Leaving two unknown. This is my Fear, Pocket Infinity may or may not be brought to current light levels(???), with the Yr1/Yr3 versions of Vex Mythoclast/Necrochasm each being counted separately(maybe New Raid Exotics have Ornamental Slots). Year Old Data Mining shows items like the "Crux of Crota" but referencing "Vex Technologies," implying a new questline. So, drop the quest for Year 3 Necro, add a quest for Year 3 Mythoclast, add Ornaments to each, justify counting each seperately... Bungo Quality Reached. Deej referenced "not wanting to get rid of the old raids(meaning Easy & Hard difficulty settings)" which further informs my thoughts on the Old Year 1 Raid Exotic Drops counting toward the Milestone. FYI, I knew Sidearms were a problem the moment they were introduced Year 1(still are), I guessed early Year 2 that Gjallarhorn would return first thing Year 3(no brainer), I guessed that the Holiday Kiosk would get the Deviled & Ghost Ghost while Festival of the Lost was active(because implementing the Ghosts into the Kiosk while the Event was Active would lessen Micro-transactions), & I knew all the Raids would return for the last major Update of Destiny(why buy new DLC if the old DLC was Light Equivelent).