forbidden

code/game/gamemodes/dynamic/dynamic_rulesets_latejoin.dm

@@ -249,6 +249,13 @@
 	minimum_players = 25
 	repeatable = FALSE
 
+/datum/dynamic_ruleset/latejoin/trim_candidates()
+	. = ..()
+	for(var/mob/living/carbon/C in candidates)
+		if(C?.dna?.species && (NOBLOOD in C?.dna?.species.species_traits))
+			candidates -= C
+			continue
+
 /datum/dynamic_ruleset/latejoin/bloodsucker/execute()
 	var/mob/latejoiner = pick(candidates) // This should contain a single player, but in case.
 	assigned += latejoiner.mind

code/game/gamemodes/dynamic/dynamic_rulesets_midround.dm

@@ -716,6 +716,11 @@
 /datum/dynamic_ruleset/midround/bloodsucker/trim_candidates()
 	. = ..()
 	for(var/mob/living/player in living_players)
+		if(iscarbon(player))
+			var/mob/living/carbon/C = player
+			if(C?.dna?.species && (NOBLOOD in C?.dna?.species.species_traits))
+				living_players -= player
+				continue
 		if(issilicon(player)) // Your assigned role doesn't change when you are turned into a silicon.
 			living_players -= player
 		else if(is_centcom_level(player.z))

code/game/gamemodes/dynamic/dynamic_rulesets_roundstart.dm

@@ -984,6 +984,12 @@
 	antag_cap = list("denominator" = 24)
 	minimum_players = 25
 
+/datum/dynamic_ruleset/roundstart/bloodsucker/trim_candidates()
+	. = ..()
+	for(var/mob/player in candidates)
+		if(player?.client?.prefs.pref_species && (NOBLOOD in player.client.prefs.pref_species.species_traits))
+			candidates.Remove(player)
+
 /datum/dynamic_ruleset/roundstart/bloodsucker/pre_execute(population)
 	. = ..()
 	var/num_bloodsuckers = get_antag_cap(population) * (scaled_times + 1)