Heroes During War
Hero upgrades are the worst because we can't use them while they upgrade. They're an essential part of any attack, and vital if anyone plans on 2 or 3-starring a base during war. Everything we upgrade in Clash of Clans is usable during Clan Wars except the King, Queen, and Warden heroes. They're out completely, which sucks.
This is also one huge area Supercell makes tons of money. Users gemming to get their King and Queen back in time for war. This will never happen in our opinion, so we came up with an alternative solution.
What if we could use the King or Queen heroes during war or attacks while they upgrade, but with no "ability". Essentially limiting their effectiveness. No rage for the King, no cloak and healing for the Queen. The Warden won't have his special skill either. We can still use them in war while upgrading but lose a key feature.