Boosts

Element boosts increase the amount of per minute to a particular element on the same island as the boost, while decreasing the amount of  per minute of the opposite element on the same island. The increased rate is 20% to the respective element and a decrease rate of 20% to the opposite element. Hybrid dragons may receive a 44% boost if they reside on an island with two Element boosts beneficial to their two elements.

You are allowed one Element Booster per element.

Note: The calculation for two boosts is NOT really 40%. For the first boost take the BASE x 20% (or use BASE x 1.2) = SINGLE BOOST RATE. For the second boost take the BASE x 20% x 20% (or use BASE x 1.2 x 1.2 which is also BASE x 1.44) = DOUBLE BOOST RATE. The same rule applies for each subsequent boost.

Boost Calculation Guide & Dragon Earning Rates are available to help with calculations