To wrap up some points about fusing since things have changed quite a bit,

1) Epics aren't fusable anymore?
2) Old boss epics armors are now fusable?
2.1) Aka, mono air (Featherblade Battlegear) + mono fire (Scorchstone Aegis) can yield Rubyplate, wanderer, cloudking, flame summoner, etc. in addition to Combustion?