diff --git a/code/__DEFINES/xeno.dm b/code/__DEFINES/xeno.dm
index 18d4908c9df7..b23389da4fb8 100644
--- a/code/__DEFINES/xeno.dm
+++ b/code/__DEFINES/xeno.dm
@@ -522,6 +522,9 @@
 // Hive Pylon protection range
 #define XENO_HIVE_PYLON_PROTECTION_RANGE 8
 
+// Fire damage multiplier
+#define XENO_FIRE_DAMAGE_MULT_VERY_LARGE 3
+
 /////////////////////////////////////////////////////////////////////////////////////
 //
 // Default scaling values
diff --git a/code/modules/mob/living/carbon/xenomorph/Xenomorph.dm b/code/modules/mob/living/carbon/xenomorph/Xenomorph.dm
index adfb65169c88..89676114f48b 100644
--- a/code/modules/mob/living/carbon/xenomorph/Xenomorph.dm
+++ b/code/modules/mob/living/carbon/xenomorph/Xenomorph.dm
@@ -206,6 +206,7 @@
 	var/evasion_modifier = 0
 	var/attack_speed_modifier = 0
 	var/armor_integrity_modifier = 0
+	var/fire_vulnerability_mult_modifier = 0
 
 	var/list/modifier_sources
 
diff --git a/code/modules/mob/living/carbon/xenomorph/life.dm b/code/modules/mob/living/carbon/xenomorph/life.dm
index 15367d9c5d61..21d63a212e35 100644
--- a/code/modules/mob/living/carbon/xenomorph/life.dm
+++ b/code/modules/mob/living/carbon/xenomorph/life.dm
@@ -83,8 +83,8 @@
 		G.die()
 		drop_inv_item_on_ground(G)
 	if(!caste || !(caste.fire_immunity & FIRE_IMMUNITY_NO_DAMAGE) || fire_reagent.fire_penetrating)
-		if(caste.fire_immunity & FIRE_VULNERABILITY && caste.fire_vulnerability_mult >= 1)
-			apply_damage(PASSIVE_BURN_DAM_CALC(fire_reagent.intensityfire, fire_reagent.durationfire, fire_stacks) * caste.fire_vulnerability_mult, BURN)
+		if(caste.fire_immunity & FIRE_VULNERABILITY && (caste.fire_vulnerability_mult + fire_vulnerability_mult_modifier) >= 1)
+			apply_damage(PASSIVE_BURN_DAM_CALC(fire_reagent.intensityfire, fire_reagent.durationfire, fire_stacks) * (caste.fire_vulnerability_mult + fire_vulnerability_mult_modifier), BURN)
 		else
 			apply_damage(armor_damage_reduction(GLOB.xeno_fire, PASSIVE_BURN_DAM_CALC(fire_reagent.intensityfire, fire_reagent.durationfire, fire_stacks)), BURN)
 		INVOKE_ASYNC(src, TYPE_PROC_REF(/mob, emote), pick("roar", "needhelp"))
diff --git a/code/modules/mob/living/carbon/xenomorph/strains/castes/boiler/trapper.dm b/code/modules/mob/living/carbon/xenomorph/strains/castes/boiler/trapper.dm
index f64bfd6b500f..8f170a5138b4 100644
--- a/code/modules/mob/living/carbon/xenomorph/strains/castes/boiler/trapper.dm
+++ b/code/modules/mob/living/carbon/xenomorph/strains/castes/boiler/trapper.dm
@@ -33,6 +33,7 @@
 	boiler.health_modifier -= XENO_HEALTH_MOD_MED
 
 	boiler.speed_modifier += XENO_SPEED_SLOWMOD_TIER_5 // compensating for base buffs
+	boiler.fire_vulnerability_mult_modifier -= XENO_FIRE_DAMAGE_MULT_VERY_LARGE // Default is 0, not 1 for some reason
 	boiler.recalculate_everything()
 
 /datum/behavior_delegate/boiler_trapper