This is literally the tenth thread about this in the past few days, try searching next time before you post. Not to mention the misleading title, it's nothing but shameless click-bait and you should feel bad.
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Click bait
If they EVER make heroes usable in war while upgrading I will quit that day. I farmed 80 hero levels and sat out of war for months because of it. MONTHS of no war and a slap in the face if it changes.
Thanks
A long long time ago, I cared about this subject. Now my Queen is lvl 40 and no longer care.