A suggestion I saw posted in Peer Support:
Class specific summons. We have elemental summons, and event summons, so why not one that provides heroes of random element but a specific class?
People are already having issues with not having appropriate heroes for the new quests, and while some of that is likely to be due to not having appropriate heroes levelled, some is probably due to not having enough heros of the correct classes. This might make it easier on them.
A class specific summoning could be a new summoning entirely or swap into the elemental slot, alternating class and elemental summons.
Kudos to a player named Balder for this idea.