Atm i got 7 out of the 8 required Mythic kill, but my cache is supposed to respawn today. However, it will still be Heroic, since i miss 1 kill. What if i wait with doing it, kill a mythic boss, will it change into a mythic box? Or if i fail it on purpose, and in the meanwhile kill the 8th boss? So when it respawns it is mythic? Will either of that work?