The Synergy Bonus rewards players for using well-matched card combinations when forming Fusions. It increases the odds of obtaining a coveted parallel card, making strategic selection of cards a critical part of the Fusion process.

When you use a card that has matching attributes to that weeks Fustion attributes, you will receive Synergy Bonus points. The more attributes that match, the more bonus points you will receive. The bonus points are:

When you click on an empty slot, Fusion will automatically show you the cards in your collection that will give you the highest amount of bonus points:

Each row of the formation will show you the total bonus points it is contributing to your synergy bonus. Such as below:

Bonus points will contribute the parallel multiplier you receive in the Synergy Bonus meter. The threshold for each multiplier is:

This is the Synergy Bonus meter:

The Synergy Bonus meter shows you how many bonus points you have and how close you are to the next bonus multiplier. 

If you want to boost the Synergy bonus you are receiving from a row in the formation, you will be able to us gold to do this. (Please note, this will only be on row per Fusion event).