I don’t know why don’t up level skill when used 100% total heroes with up level skill.
25 × 2hero or 50× 1hero (same color)
You can’t use 25 or 50 heroes at once, only 10.
Up 5 heroes per time.
Used 5 times for 10×1heroes or
5 time for 5×2heroes.
Check out this Topic
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Having same problem since update. Heros not leveling special skills. No matter 1 start, 2 star, 3 star 5 at once 10 at once same outcome does not level special skill. I dont understand either why this is going on.
There is already a thread open on this topic (see link above, in Sorsha’s post).