Kvostov turns into the Kvostov Mark II (uncommon) after killing 1,000 vex, cabal, fallen, AND hive. (Majors count as 5, ultras as 10), then buying the "birth of destruction" from xur for 27 coins, and turning it into the weapon seller. Mark II turns into the mark III (rare) after getting 2,000 crucible kills (each kill is 1) with this gun, and buying the "ritual of disaster" from xur the next week for 27 strange coins. Mark III turns into the "Ol' Reliable"(legendary) after killing 500 praetorians, 500 Kells guard, 500 phalanxes, 500 wizards, and then buying the "augmented darkness" from xur during the next week for 27 strange coins. Ol' Reliable can then be upgraded through getting the exotic bounty called "Through Hell and Back" -kill each strike boss 25 times with this gun -collect 200 black wax, blue polyphage, supply codes, and ether seeds -turn in 50 heavy ammo synthesis -kill 500 players in crucible with white rarity guns(death will RESET progress) -get the "Soul of time" which is dropped from atheon. (Atheon will only drop this to a player who has the vex mythoclast equipped, drop rate is the same as the vex) -purchase the "cleansing of true darkness" from the speaker for 100 motes of light. Congratz, you have obtained Dastardly deed (exotic), the only auto rifle with explosive rounds.