Index: binaries/data/mods/public/gui/common/tooltips.js
===================================================================
--- binaries/data/mods/public/gui/common/tooltips.js
+++ binaries/data/mods/public/gui/common/tooltips.js
@@ -241,7 +241,7 @@
 	return g_DamageTypes.GetTypes().filter(
 		dmgType => dmg[dmgType]).map(
 		dmgType => sprintf(translate("%(damage)s %(damageType)s"), {
-			"damage": dmg[dmgType].toFixed(1),
+			"damage": dmg[dmgType] == "Infinity" ? "∞" : dmg[dmgType].toFixed(1),
 			"damageType": unitFont(translateWithContext("damage type", g_DamageTypes.GetNames()[dmgType]))
 		})).join(commaFont(translate(", ")));
 }
Index: binaries/data/mods/public/simulation/components/Armour.js
===================================================================
--- binaries/data/mods/public/simulation/components/Armour.js
+++ binaries/data/mods/public/simulation/components/Armour.js
@@ -34,26 +34,34 @@
 
 /**
  * Take damage according to the entity's armor.
- * @param {Object} strengths - { "hack": number, "pierce": number, "crush": number } or something like that.
+ * @param {Object} attackStrengths - { "hack": number, "pierce": number, "crush": number } or something like that.
  * @param {number} multiplier - the damage multiplier.
  * Returns object of the form { "killed": false, "change": -12 }.
  */
-Armour.prototype.TakeDamage = function(strengths, multiplier = 1)
+Armour.prototype.TakeDamage = function(attackStrengths, multiplier = 1)
 {
 	if (this.invulnerable)
 		return { "killed": false, "change": 0 };
 
 	// Adjust damage values based on armour; exponential armour: damage = attack * 0.9^armour
-	var armourStrengths = this.GetArmourStrengths();
+	let armourStrengths = this.GetArmourStrengths();
 
 	// Total is sum of individual damages
 	// Don't bother rounding, since HP is no longer integral.
-	var total = 0;
-	for (let type in strengths)
-		total += strengths[type] * multiplier * Math.pow(0.9, armourStrengths[type] || 0);
+	let cmpHealth = Engine.QueryInterface(this.entity, IID_Health);
+	let total = 0;
+	for (let type in attackStrengths)
+	{
+		if (attackStrengths[type] == "Infinity")
+		{
+			// Special damage to instantly kill entities.
+			total = cmpHealth.GetHitpoints();
+			break;
+		}
+		total += attackStrengths[type] * multiplier * Math.pow(0.9, armourStrengths[type] || 0);
+	}
 
 	// Reduce health
-	var cmpHealth = Engine.QueryInterface(this.entity, IID_Health);
 	return cmpHealth.Reduce(total);
 };
 
Index: binaries/data/mods/public/simulation/components/Attack.js
===================================================================
--- binaries/data/mods/public/simulation/components/Attack.js
+++ binaries/data/mods/public/simulation/components/Attack.js
@@ -456,7 +456,8 @@
 	}
 
 	let applyMods = damageType =>
-		ApplyValueModificationsToEntity("Attack/" + type + splash + "/Damage/" + damageType, +(template.Damage[damageType] || 0), this.entity);
+		template.Damage[damageType] == "Infinity" ? "Infinity" :
+			ApplyValueModificationsToEntity("Attack/" + type + splash + "/Damage/" + damageType, +(template.Damage[damageType] || 0), this.entity);
 
 	if (type == "Capture")
 		return { "value": ApplyValueModificationsToEntity("Attack/Capture/Value", +(template.Value || 0), this.entity) };
Index: binaries/data/mods/public/simulation/helpers/DamageTypes.js
===================================================================
--- binaries/data/mods/public/simulation/helpers/DamageTypes.js
+++ binaries/data/mods/public/simulation/helpers/DamageTypes.js
@@ -1,7 +1,7 @@
 DamageTypes.prototype.BuildSchema = function(helptext = "")
 {
 	return "<interleave>" + this.GetTypes().reduce((schema, type) =>
-		schema + "<element name='"+type+"' a:help='"+type+" "+helptext+"'><ref name='nonNegativeDecimal'/></element>",
+		schema + "<element name='"+type+"' a:help='"+type+" "+helptext+"'><choice><ref name='nonNegativeDecimal'/><value>Infinity</value></choice></element>",
 	"") + "</interleave>";
 };
 
Index: binaries/data/mods/public/simulation/templates/template_unit_cavalry.xml
===================================================================
--- binaries/data/mods/public/simulation/templates/template_unit_cavalry.xml
+++ binaries/data/mods/public/simulation/templates/template_unit_cavalry.xml
@@ -14,7 +14,7 @@
     </Capture>
     <Slaughter>
       <Damage>
-        <Hack>100.0</Hack>
+        <Hack>Infinity</Hack>
         <Pierce>0.0</Pierce>
         <Crush>0.0</Crush>
       </Damage>
Index: binaries/data/mods/public/simulation/templates/template_unit_infantry.xml
===================================================================
--- binaries/data/mods/public/simulation/templates/template_unit_infantry.xml
+++ binaries/data/mods/public/simulation/templates/template_unit_infantry.xml
@@ -14,7 +14,7 @@
     </Capture>
     <Slaughter>
       <Damage>
-        <Hack>50.0</Hack>
+        <Hack>Infinity</Hack>
         <Pierce>0.0</Pierce>
         <Crush>0.0</Crush>
       </Damage>
Index: binaries/data/mods/public/simulation/templates/template_unit_support_female_citizen.xml
===================================================================
--- binaries/data/mods/public/simulation/templates/template_unit_support_female_citizen.xml
+++ binaries/data/mods/public/simulation/templates/template_unit_support_female_citizen.xml
@@ -13,7 +13,7 @@
     </Melee>
     <Slaughter>
       <Damage>
-        <Hack>25.0</Hack>
+        <Hack>Infinity</Hack>
         <Pierce>0.0</Pierce>
         <Crush>0.0</Crush>
       </Damage>