Artistic Forces/Horde Bonus

In Artistic Forces, the Horde Bonus is an inherent game mechanic related to the playstyle and advantage of mass numbers of units in large formations. However, this mechanic is factionally exclusive to both the Pacific Dragon Force and Josei Guntai.

It is unknown what the rationale behind the bonus actually is, but may be a result of troops' increased morale and fervor in battle.

Pacific Dragon Force
When in a group of five or more Chinese units with the Horde Bonus ability are in close proximity to one another (radius of 30), they become emboldened and confident in their victory due to their sheer numbers — they become a Horde. Once the Horde Bonus is activated, a yellow star will appear underneath the unit, and increased their firing rate by 50%, which is even stronger than Josei Gunta's without using Sisterhood Frenzy.

The Horde Bonus can be improved by the Nationalism upgrade, which also adds a yellow circle around the star.

Josei Guntai
Like the Pacific Dragon Force, the Josei Guntai has the Horde Bonus ability to some of their units, but the only differences are their factional emblem and attacking rate. Whenever five or more Josei Guntai units with the Horde Bonus ability are amassed and too close to each other in a radius of 30, they can possibly be strengthened and confident in their victory by mass numbers, becoming a horde. When the Horde Bonus is active, there is a magenta star in front of a pink Sakura (or cherry blossom in translation), calling it Sakuraboshi, beneath the unit, and gives them a 25% bonus to increase their attacking rate as a factional advantage.

If the Horde Inspiration upgrade is purchased at the Internet Popularity Center, it improves the Horde Bonus by 25% (50% in total) and includes a pink circled text that reads as Taigun Bonasu (たいぐんボーナス) in kana around the Sakuraboshi.

When the Sisterhood Frenzy is active in a targeted area, the Horde Bonus of certain groups within the area is extended by 25% (50% by default or 75% with Horde Inspiration installed in total) in comparison to that of the Pacific Dragon Force.

Note
Any combination of the above mentioned units would activate the Horde Bonus. Garrisoned infantry benefit from this bonus, as long as it was active when they entered. Thus, for a building garrisoned one by one, it may be beneficial to evacuate the troops, wait a moment for them to gain the Horde Bonus, then immediately re-garrison them.