Rain v1

code/game/gamemodes/dynamic/dynamic_rulesets_events.dm

@@ -777,4 +777,14 @@
 	weight = 5
 	repeatable = TRUE
 	repeatable_weight_decrease = 3
-	occurances_max = 3
+	occurances_max = 3
+
+/datum/dynamic_ruleset/event/oxygen_rain
+	name = "Oxygen Rain"
+	typepath = /datum/round_event/oxygen_rain
+	requirements = list(0,0,0,0,0,0,0,0,0,0)
+	high_population_requirement = 0
+	weight = 1 //This is a rare occurence.
+	repeatable = FALSE
+	occurances_max = 1
+	map_whitelist = list("LayeniaStation.dmm")