The crafting material needed to craft a weapon will come from rng weapon drops with a red frame around their weapon symbol. You then use that (garbage) weapon to "extract" the needed crafting essence. That will just lead to the following gameplay loop: Play the game, hope for an rng drop of a red frame weapon, load up shattered throne thrallway, sit there for 10 minutes killing thrall with that garbage weapon, get the crafting material. Hope for another rng red frame weapon drop, rinse and repeat, until you can finally "craft" your weapon with that "earned" material. Then you have to use that weapon for A LONG time to finally be able to use all perks on it. And that in theory is great. BUT in literally every activity you play with others, people either rush through the levels, pulling you forward or killsteal all your kills. That's why people finish catalysts for exotics in the thrall room or at shuro chi. So this crafting system will either take extremely long and will be really annoying, fighting for kills AGAINST other players in strikes etc. or you will constantly hop into the thrallway for everything. Oh yea and then they confirmed they aren't expanding vault space at all and you will have no space to put your new crafted weapons. Bright days are ahead guys :)