The Dynamic is one of the hero factions in the game.
As it deals increased damage when you use heroes of the faction that counter your opponent, and vice versa,

The Dynamic faction counters the Wisdom faction, while the Resolute faction counters the Dynamic.

You will gain the following bonus attributes for all heroes from the Resolute faction based on how many are deployed on the battlefield:
- 2 deployed Heroes:
Troops: Increase attack by 10%
Solo: Increase attack by 3%

- 3 deployed Heroes:
Troops: Increase attack by 25% and Hp by 25%
Solo: Increase attack by 5%

To learn more about them in-game:
-Go to the Hero Hall in your city.
-Tap on Hero Recruitment.
-You’ll find the faction icons at the top right of the screen; Press on it for more details