You can farm the drops and trade them in for random legendaries at the smith, which you can target by type (in my case accessories). I’m after the mythical Vigar’s Hunger necklace, running a Drain Essence build. I ran Elite mode for about 4 hours last night and I actually got more than on ultimate for time spent that way, not sure if I was lucky or clear speed was so fast it made it more efficient. They are still very rare though. I haven’t tried dismantling yet, I just assumed it was a waste of dynamite with super low chances.