LogFAQs > #980250435

Duran is the new BIS for all Follow-Up attack characters. If the character also has a notable damage dealing Ultimate, like Jing Yuan or Ratio, Solsotto will still be totally fine if not better depending on substats, but characters like Topaz and Clara need to switch to this immediately.

Forge is extremely good for Firefly.....but it's basically just going to be for Firefly. An argument could be made that for Break Effect characters it is like the Quantum Set situation where it can sometimes be used on a non-Fire character against Fire Weak enemies (Xueyi, considering her type ignoring ultimate, definitely gets value from this against Fire Weak enemies), but probably not super worth it. The 2 other characters besides Sam who would benefit most, Himeko and Xueyi, already reap the full benefits of Salsotto.

The Wind is a wild one. Can be a great Ratio set if you have better pieces than his current debuff set. Good on Topaz but not better than the current following attack set for her, same with Herta. Jing Yuan is in a similar situation as Ratio, could go with either this or the current FUA set. However where this reaaaaally shine is with Clara, this and the Duran Planar are both huuuuuuuuge retroactive buffs for her, which she barely even needed TBH, but with these sets she's going to go up like a full tier. It's also a fantastic 4 piece for Yanqing and makes him much more viable.

I haven't looked into the Firefly kit hard enough yet to see how Iron Cavalry goes for them, I assume this is their personal set though just because lol. I can say for sure that it's absolutely the BiS for Xueyi and for Boothill.