Affinity
There are 5 base affinities – Air (Dodge), Water (Energy), Earth (Solid), Fire (Damage) and Nature (Heal).
Fusing illuvials can gain an additional affinity, creating a Composite Affinity of which there are 15. A composite affinity is the fusion of two affinities into a new one which embodies characteristics of its’ two parts.
Affinity Synergy is applied based on the number of units which share the same Affinity on your board. There are 3 different bonus thresholds for base and composite Affinities. Composite Affinities count as their own affinity as well as their respective parts (eg: Wildfire provides 1 Nature count as well as 1 Fire).