So there are three special aura effects that are currently limited to a specific faction's heroes.

Only Knight heroes can use the "Hellfire" effect.
Only Samurai heroes can use the "Cherry Blossom" effect.
And only Viking heroes can use the "Thor's Strike" effect.

My suggestion would be... say you choose to fight for the Knights, then "Hellfire" becomes available on ALL your heroes (assuming you purchased it of course), in addition to whatever effect is specific to them.

So a Samurai LawBringer, as a totally random example and not at all indicative of my faction/main </blatant lies> would have Hellfire AND Cherry Blossom as usable effects.

Yes? No? Maybe so?