EDIT: Note that this gets multiplied with the other multipliers, so for example: • +50% speed from advancement • +20% speed from Clan Wars • +10% speed from Mollification = 100% - (100-50)% * (100-20)% * (100-10)% = 36%
Would have been much quicker for me if I had just posted in here.
Or used the forum search function so search the word "Mollification" (literally the first search result has the list of all the Hardened Levels Rewards)