I was hoping for a Queenbreaker catalyst when the season dropped. Unfortunately, it didn't make the cut, and as someone pointed out already, Queenbreaker is incompatible with Arc 3.0. Moving it to its D1 special weapon slot might work, if you choose to see it as an Arc counterpart to Mythoclast (different scopes/RoF vs swapping fire types). The issue there would be keeping it from becoming another Lorentz. Hopefully, it get its time in the spotlight again. It deserves that much.