Damage Modifiers

A damage modifier is a percentage value that alters base damage when calculating damage. Other ways to interpret this include damage multiplier, damage susceptibility, damage resistance, damage vulnerability, etc.

Every unit in the game is assigned an armour class, with each class containing a table of modifiers that determine how well it absorbs the various damage types.

The damage percentages start at 100% for unaltered damage. Values over 100% indicate more damage will be taken, while values under 100% mean less damage is taken.

Susceptible to...

Ammo Type	Damage Modifier Category
	T+I	Hu+	PA1	PS	Tnk	Snk	Eth	Mut	Sil	Chr	Rea	Sec	Cyb	Zom
Armour Piercing	100	100	100	100	100	100	100	60	100	100	100	100	80	60
Incendiary	100	100	80	0	40	70	70	100	0	80	170	100	100	100
High-Explosive	100	100	100	100	75	100	100	100	130	100	100	80	60	80
Laser	100	100	100	100	100	100	100	100	100	100	100	150	100	70
Plasma	100	100	100	100	100	100	100	100	100	100	100	80	100	70
Stun	100	100	90	80	1002	100	80	100	100	90	100	100	100	0
Melee	100	120	100	100	90	100	100	100	100	100	100	100	100	100
Acid Spit	100	160	110	100	40	100	100	100	100	100	100	100	100	100

¹ Due to a bug in the unit spawn routine, Personal Armor gets assigned the modifiers of a Power Suit.
² Tanks cannot be stunned.

Column	Modifier Index	Unit Type(s)
T+I	00 / x00	Terrain and items.
Hu+	01 / x01	Unarmored Soldiers, Civilians, Sectoids, Celatids and Floaters.
PA	02 / x02	Personal Armor.
PS	03 / x03	Power and Flying Suits.
Tnk	04 / x04	Tanks and Hovertanks.
Snk	05 / x05	Snakemen.
Eth	06 / x06	Ethereals.
Mut	07 / x07	Mutons.
Sil	08 / x08	Silacoids.
Chr	09 / x09	Chryssalids.
Rea	10 / x0A	Reapers.
Sec	11 / x0B	Sectopods.
Cyb	12 / x0C	Cyberdiscs.
Zom	13 / x0D	Zombies.

To summarize re: the all important X-COM armor:

• AP, HE, Laser, and Plasma: All types of X-COM armor have full/normal (100%) susceptibility to these types of damage
• Stun: All armour has a 20% resistance to stun damage. (Personal Armour should only have a 10% resistance, but receives the modifiers of a Power Suit due to a bug.)
• Incendiary: All armour is immune to fire damage. (Personal Armour should only have a 20% resistance, but is bugged.)

See Also

• GEOSCAPE.EXE
• Alien Life Forms
• Weapons
• Damage Modifiers (TFTD)