cap and percent gain

code/modules/cm_aliens/structures/special/pylon_core.dm

@@ -135,6 +135,9 @@
 		structure.activated = TRUE
 		addtimer(CALLBACK(structure, PROC_REF(give_larva)), XENO_PYLON_ACTIVATION_COOLDOWN, TIMER_UNIQUE|TIMER_OVERRIDE|TIMER_LOOP|TIMER_DELETE_ME)
 
+#define ENDGAME_LARVA_CAP_MULTIPLIER 0.4
+#define LARVA_ADDITION_MULTIPLIER 0.05
+
 /// Looped proc via timer to give larva after time
 /obj/effect/alien/resin/special/pylon/endgame/proc/give_larva()
 	if(!activated)
@@ -143,9 +146,22 @@
 	if(!linked_hive.hive_location || !linked_hive.living_xeno_queen)
 		return
 
-	linked_hive.stored_larva++
+	var/list/hive_xenos = linked_hive.totalXenos
+
+	for(var/mob/living/carbon/xenomorph/xeno in hive_xenos)
+		if(!xeno.counts_for_slots)
+			hive_xenos -= xeno
+
+	if(length(hive_xenos) > (length(GLOB.alive_human_list) * ENDGAME_LARVA_CAP_MULTIPLIER))
+		return
+
+	linked_hive.partial_larva += length(hive_xenos) * LARVA_ADDITION_MULTIPLIER
+	linked_hive.convert_partial_larva_to_full_larva()
 	linked_hive.hive_ui.update_burrowed_larva()
 
+#undef ENDGAME_LARVA_CAP_MULTIPLIER
+#undef LARVA_ADDITION_MULTIPLIER
+
 //Hive Core - Generates strong weeds, supports other buildings
 /obj/effect/alien/resin/special/pylon/core
 	name = XENO_STRUCTURE_CORE

code/modules/mob/living/carbon/xenomorph/xeno_defines.dm

@@ -1114,6 +1114,10 @@
 /datum/hive_status/proc/increase_larva_after_burst()
 	var/extra_per_burst = CONFIG_GET(number/extra_larva_per_burst)
 	partial_larva += extra_per_burst
+	convert_partial_larva_to_full_larva()
+
+///Called after times when partial larva are added to process them to stored larva
+/datum/hive_status/proc/convert_partial_larva_to_full_larva()
 	for(var/i = 1 to partial_larva)
 		partial_larva--
 		stored_larva++