This is not as described! Bug?
Same happens for me. I got to level IV (kill 300 heroes) and then it stays grayed out.
This is not a bug but end of the mission.
How is it not as described…?
You finished the 300 which is the final tier…
Check the main PoV discussion thread/ OP that Zeph made:
Note the bottom bit…?
Been said many many times on that main thread too…
Flagged for closure… Not a bug.
You can always try making it a #ideas-feature-requests but SGG won’t change it for this current valour challenge… Maybe next time…
personally don’t think it’ll change but you can always try
Their way of forcing the daily challenges in order to get the overall completion I suppose.