Yes, in fact it's best with supports

Do i use it with bennett for er ?

Depends on which supports but yea. The set works especially well with Natlan characters who are played off field, like Xilonen, Citlali and Ororon

Yeah it only really works for Natlan characters too so it'd be a waste on Bennet

Yes ik cuz 2 piece set but 4 piece gives general buff without natlan right ? i got all ER cinder set so i asked, do I use on kachina then? dont have citlali, ororon or xilonen yet

Only with those from Natlan.