Apologies ahead of time if this was discussed, I did search the forums and didn't see this specifically addressed.
I am suggesting an additional way in which players can upgrade their heroes, and promote the use of heroes more so.
Issue: Many players have <10 Heroes even at TH9, Many players when they get Dark Elixir are upgrading Dark Elixir troops rather than their Heroes; IE Minions, Hogs, etc...
Proposition: Heroes earn 1 DE reduction for each Troop they kill on defense or offense and 1 DE reduction for every Building and 2 for every Defensive Structure they destroy in battle.
How it Helps: The reduction would help all those with <40 Heroes, From Th7+, and because of the reduction to hero costs, the available DE can be used on other DE troop upgrades.
Its a tad early for me to attempt to math the actual reduction into percentages and I clearly haven't had enough coffee yet, but I can't see this being more than a 2% change in upgrading costs.
Blow Back: With the above non caffeinated comment, the amount of DE available could change due to this reduction, since DE used on Hero Upgrading, again not enough coffee
Not a bad idea, but they just reduced the heroes training time in the last update because in the date before, the heroes were nerfed, so I'm not sure if they will change the heroes again
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Clash Royale is okay too...