Boosters can be very helpful when you find yourself in a pickle. Stuck on a challenging level you just can’t quite beat? 2 moves from winning yet there’s one Charm just blocking you from success? Can't move that Diamond with those randomly colored Charms underneath?
How do I earn boosters?
You'll be awarded a few, free boosters when you unlock them at the right levels. After that keep an eye out for the Special Chests which will randomly appear on the Saga map, if you can find the key in time you'll be able to unlock it and you may be lucky enough to find some boosters inside.
You are also always able to buy boosters using Gold Bars from the Diamond Diaries Store.