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Kingdoms and War / Mass Combat / Optional Mass Combat Rules

Splitting an Army

Source Ultimate Campaign pg. 246
You can divide an army into smaller armies. At any time outside of combat, you may split an army into two armies that are each one size category smaller. One of these armies retains the larger army’s commander; you must assign a commander to the other army.

Calculate each smaller army’s statistics based on its new size. The smaller armies retain all of the larger army’s statistics and effects (including tactics, boons, resources, commander, and so on) except those based on size (such as ACR and statistics based on ACR). Each smaller army reduces its Morale by 1.

Determine what percentage of its full normal hit points the larger army had. Each smaller army has this proportion of hit points for its new size. For example, if the large army was at 70% (28 hp out of 40), each smaller army is at 70% of the full hit points for its size.

There is no limit to how many times you can split an army. Even a Colossal army can split several times until the CR of its individual units is too small to actually count as an army.

Archives of Nethys

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Splitting an Army