Wounded resolve: how low HP lowers morale

A brother's displayed Resolve never changes when he is wounded. But taking a hit while low on hitpoints makes him more likely to fail the morale check that the hit triggers. The penalty is hidden: it applies only to that one check, only on the brother who was hit, and it grows as his missing HP grows.

The trigger

When a hit deals at least 15 hitpoint damage to a brother, and he is affected by losing hitpoints, the hit forces a morale check on him.

The penalty

That check runs at a difficulty of:

diff = -40 * (1 - currentHP / maxHP) - attacker's ThreatOnHit

The current HP is read after the hit's damage is applied. The difficulty is subtracted from the brother's chance to hold, so it acts as an effective Resolve penalty that scales linearly with missing HP.

Current HP	Effective Resolve penalty
full	0
half	-20
quarter	-30
near death	-40

Where it does NOT apply

The missing-HP term appears in no other morale check. A wounded brother is no more likely to break from:

an ally being killed
an ally fleeing
being shoved into an enemy zone of control (flat difficulty 40)
recovering morale by rallying

Only a hit of 15+ damage landing on the brother himself reads his current HP.

Multi-hit skills

For a skill that hits several times, each sub-hit of 15+ damage runs its own morale check against the HP left after that sub-hit.

What disables it

A brother who is not affected by losing hitpoints takes no on-hit morale check at all. In Battle Brothers the Deathwish trait removes it.

Sources

Battle Brothers 1.5.1.8 game scripts.