2

code/modules/mob/living/carbon/alien/alien.dm

@@ -11,6 +11,10 @@
 	bubble_icon = "alien"
 	type_of_meat = /obj/item/reagent_containers/food/snacks/meat/slab/xeno
 
+	/// Whether they can ventcrawl; this is set individually for 'humanoid' and 'royal' types
+	/// 'royal' types (Praetorian, Queen) cannot ventcrawl
+	var/can_ventcrawl
+
 	/// How much brute damage without armor piercing they do against mobs in melee
 	var/meleeSlashHumanPower = 20
 	/// How much power they have for DefaultCombatKnockdown when attacking humans
@@ -38,7 +42,7 @@
 
 	create_internal_organs()
 
-	if(!(name == "alien queen"))
+	if(can_ventcrawl)
 		AddElement(/datum/element/ventcrawling, given_tier = VENTCRAWLER_ALWAYS)
 
 	. = ..()

code/modules/mob/living/carbon/alien/humanoid/humanoid.dm

@@ -20,6 +20,8 @@
 	bodyparts = list(/obj/item/bodypart/chest/alien, /obj/item/bodypart/head/alien, /obj/item/bodypart/l_arm/alien,
 					 /obj/item/bodypart/r_arm/alien, /obj/item/bodypart/r_leg/alien, /obj/item/bodypart/l_leg/alien)
 
+	can_ventcrawl = TRUE
+
 
 //This is fine right now, if we're adding organ specific damage this needs to be updated
 /mob/living/carbon/alien/humanoid/Initialize()

code/modules/mob/living/carbon/alien/humanoid/queen.dm

@@ -9,6 +9,7 @@
 	layer = LARGE_MOB_LAYER //above most mobs, but below speechbubbles
 	pressure_resistance = 200 //Because big, stompy xenos should not be blown around like paper.
 	butcher_results = list(/obj/item/reagent_containers/food/snacks/meat/slab/xeno = 20, /obj/item/stack/sheet/animalhide/xeno = 3)
+	can_ventcrawl = FALSE
 
 	meleeKnockdownPower = 125
 	meleeSlashHumanPower = 30