This idea came from strike exclusive gear from OG Destiny, with a twist. Also, i want to help the longevity of the game as Bungie uses community  ideas for rough drafts. Also a requirement must be met from bungie as this will not work if they don't. All strikes need to be accesible at all times. Enable to purchase legendary engrams from Rahool and Tyra. Treasure Keys will be created. Keys maybe obtain through public events (2-3 percent chance), 100 percent chance through normal nightfall and prestige has a 7 seven percent chance of getting an extra key; and with Lost Sectors you have loot for treasure key parts (Limited to 21 parts weekly per each character.), then take them to Cayde to assemble them. 20 Treasure Key Parts will enable you buy legendary engrams. (200 parts for Exotic) Treasure parts can also be disassemble for Mod Component and 3 shards. Now in regards to strikes: At the end of the strike, there will be an extra chest. The extra chest will be treasure key chest. It should give you the strike specific loot. The loot table ; Weapon theme for strike Or one armor The loot table for armor of each strike should have a theme race armor. Also, each strike should have 1 excusive armor piece for each character. For example, you may obtain a Nessus theme chest piece for a warlock , while you can get an Exudus Crash theme helmet. For OG Destiny players, i know this idea is a revamped version of OG Destiny strikes, but i see potential for just for making loot better and the game "grindable". Please let me tell me and others your ideas.