When you hit "upgrade" on a hero, you are accepting that:
- You will spend some DE
- You will wait some time where you cannot use your hero, but will be improved for the future.
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When you hit "upgrade" on a hero, you are accepting that:
- You will spend some DE
- You will wait some time where you cannot use your hero, but will be improved for the future.
I've been in wars without one and once without both of my heroes. Yes, I had to choose a lower opponent but it didn't affect the stars I was able to contribute to War, nor do I think it affected the final outcome of the war. What it did do was force me to rethink my attack strategy, which when it worked was very rewarding.