Boosts
Before departing on a Quest, you have the option to consume Gems to activate Boosts, which grant various bonus effects.
You can choose from an Experience Boost, a Gold Boost, or a Random Boost which may grant rare and powerful bonus effects.
Multiple Boosts can be used together, and their effects will stack.

For example, if you activate a Gold Boost to obtain 1.5x (+50%) Gold and a Random Boost that also grants 1.5x (+50%) Gold, the effects will be added to each other. Therefore, you will get double Gold (+100%) while the effects are active.