Add 5 new gases, related interactions/items/content, changes parts of fusion

code/datums/components/crafting/recipes.dm

@@ -870,3 +870,14 @@
 	reqs = list(
 		/obj/item/reagent_containers/food/snacks/grown/wheat = 50
 	)
+
+
+/datum/crafting_recipe/elder_atmosian_statue
+	name = "Elder Atmosian Statue"
+	result = /obj/structure/statue/elder_atmosian
+	time = 60
+	reqs = list(/obj/item/stack/sheet/mineral/metal_hydrogen = 10,
+				/obj/item/grenade/gas_crystal/x_crystal = 1,
+				/obj/item/grenade/gas_crystal/y_crystal = 1,
+				/obj/item/grenade/gas_crystal/z_crystal = 1,)
+	category = CAT_MISC

code/game/objects/items/fireaxe.dm

@@ -70,3 +70,18 @@
 
 /obj/item/fireaxe/boneaxe/update_icon_state()
 	icon_state = "bone_axe0"
+
+/*
+ * Metal Hydrogen Axe
+ */
+/obj/item/fireaxe/metalh2axe  // Blatant imitation of the fireaxe, but made out of metallic hydrogen
+	icon_state = "metalh2_axe0"
+	name = "metallic hydrogen axe"
+	desc = "A large, menacing axe made of an unkown substance that the most elder atmosians calls Metallic Hydrogen. Truly an otherwordly weapon."
+
+/obj/item/fireaxe/metalh2axe/ComponentInitialize()
+	. = ..()
+	AddComponent(/datum/component/two_handed, force_unwielded=6, force_wielded=26, icon_wielded="metalh2_axe1")
+
+/obj/item/fireaxe/metalh2axe/update_icon_state()
+	icon_state = "metalh2_axe0"

code/game/objects/items/grenades/atmos_grenades.dm

@@ -0,0 +1,74 @@
+/obj/item/grenade/gas_crystal
+	desc = "Some kind of crystal, this shouldn't spawn"
+	name = "Gas Crystal"
+	icon = 'icons/obj/grenade.dmi'
+	icon_state = "bluefrag"
+	inhand_icon_state = "flashbang"
+	resistance_flags = FIRE_PROOF
+
+
+/obj/item/grenade/gas_crystal/x_crystal
+	name = "X Crystal"
+	desc = "A crystal made from the Gas X, it's cold to the touch."
+	var/stamina_damage = 30
+	var/freeze_range = 4
+
+/obj/item/grenade/gas_crystal/y_crystal
+	name = "Y Crystal"
+	desc = "A crustal made from the Gas Y, you can see the liquid gases inside."
+	var/refill_range = 5
+
+/obj/item/grenade/gas_crystal/z_crystal
+	name = "Z Crystal"
+	desc = "A crustal made from the Gas Z, you can see the liquid plasma inside."
+	ex_dev = 1
+	ex_heavy = 2
+	ex_light = 4
+	ex_flame = 2
+
+/obj/item/grenade/gas_crystal/preprime(mob/user, delayoverride, msg = TRUE, volume = 60)
+	var/turf/T = get_turf(src)
+	log_grenade(user, T) //Inbuilt admin procs already handle null users
+	if(user)
+		add_fingerprint(user)
+		if(msg)
+			to_chat(user, "<span class='warning'>You crush the [src]! [capitalize(DisplayTimeText(det_time))]!</span>")
+	if(shrapnel_type && shrapnel_radius)
+		shrapnel_initialized = TRUE
+		AddComponent(/datum/component/pellet_cloud, projectile_type=shrapnel_type, magnitude=shrapnel_radius)
+	active = TRUE
+	icon_state = initial(icon_state) + "_active"
+	playsound(src, 'sound/effects/hit_on_shattered_glass.ogg', volume, TRUE)
+	SEND_SIGNAL(src, COMSIG_GRENADE_ARMED, det_time, delayoverride)
+	addtimer(CALLBACK(src, .proc/prime), isnull(delayoverride)? det_time : delayoverride)
+
+/obj/item/grenade/gas_crystal/x_crystal/prime(mob/living/lanced_by)
+	. = ..()
+	update_mob()
+	for(var/turf/T in view(freeze_range,loc))
+		if(isopenturf(T))
+			var/turf/open/F = T
+			if(F.air.temperature > 400)
+				F.air.temperature = 260
+			if(F.air.gases[/datum/gas/plasma])
+				F.air.gases[/datum/gas/plasma][MOLES] -= F.air.gases[/datum/gas/plasma][MOLES] * 0.5
+			F.air.gases[/datum/gas/nitrogen][MOLES] += 50
+			for(var/mob/living/carbon/L in T)
+				L.adjustStaminaLoss(stamina_damage)
+				L.adjust_bodytemperature(-150)
+	qdel(src)
+
+/obj/item/grenade/gas_crystal/y_crystal/prime(mob/living/lanced_by)
+	. = ..()
+	update_mob()
+	for(var/turf/T in view(refill_range,loc))
+		if(isopenturf(T))
+			var/turf/open/F = T
+			F.air.gases[/datum/gas/nitrogen][MOLES] += 1400
+			F.air.gases[/datum/gas/oxygen][MOLES] += 600
+	qdel(src)
+
+/obj/item/grenade/gas_crystal/z_crystal/prime(mob/living/lanced_by)
+	. = ..()
+	update_mob()
+	qdel(src)

code/game/objects/items/stacks/sheets/mineral.dm

@@ -482,6 +482,9 @@ GLOBAL_LIST_INIT(abductor_recipes, list ( \
 //Metal Hydrogen
 GLOBAL_LIST_INIT(metalhydrogen_recipes, list(
 	new /datum/stack_recipe("incomplete servant golem shell", /obj/item/golem_shell/servant, req_amount=20, res_amount=1),
+	new /datum/stack_recipe("ancient armor", /obj/item/clothing/suit/armor/riot/knight/greyscale, req_amount = 8, res_amount = 1),
+	new /datum/stack_recipe("ancient helmet", /obj/item/clothing/head/helmet/knight/greyscale, req_amount = 5, res_amount = 1),
+	new /datum/stack_recipe("metallic hydrogen axe", /obj/item/fireaxe/metalh2axe, req_amount = 15, res_amount = 1),
 	))
 
 /obj/item/stack/sheet/mineral/metal_hydrogen

code/game/objects/structures/statues.dm

@@ -300,3 +300,13 @@
 	desc = "A bust depicting a certain 19th century economist. You get the feeling a specter is haunting the station."
 	icon_state = "marx"
 	art_type = /datum/component/art/rev
+
+///////////Elder Atmosian///////////////////////////////////////////
+
+/obj/structure/statue/elder_atmosian
+	name = "Elder Atmosian"
+	desc = "A statue of an Elder Atmosian, capable of bending the laws of thermodinamics at his/her will"
+	icon_state = "eng"
+	material_drop_type = /obj/item/stack/sheet/mineral/metal_hydrogen
+	max_integrity = 1000
+	impressiveness = 100

code/game/turfs/open/_open.dm

@@ -270,3 +270,8 @@
 		air.assert_gas(/datum/gas/pluoxium)
 		air.gases[/datum/gas/pluoxium][MOLES]+=(pulse_strength/4000)
 		air.garbage_collect()
+	if (air.gases[/datum/gas/hydrogen])
+		pulse_strength = min(pulse_strength, air.gases[/datum/gas/hydrogen][MOLES] * 1000)
+		air.gases[/datum/gas/hydrogen][MOLES] = max(air.gases[/datum/gas/hydrogen][MOLES] - (pulse_strength/1000), 0)
+		air.assert_gas(/datum/gas/tritium)
+		air.gases[/datum/gas/tritium][MOLES] += (pulse_strength / 1000)

code/modules/atmospherics/gasmixtures/gas_types.dm

@@ -170,6 +170,51 @@ GLOBAL_LIST_INIT(nonreactive_gases, typecacheof(list(/datum/gas/oxygen, /datum/g
 	dangerous = TRUE
 	rarity = 700
 
+/datum/gas/gas_x
+	id = "gas_x"
+	specific_heat = 150
+	name = "Gas X"
+	dangerous = TRUE
+	gas_overlay = "gas_x"
+	moles_visible = MOLES_GAS_VISIBLE
+	rarity = 100
+
+/datum/gas/gas_y
+	id = "gas_y"
+	specific_heat = 100
+	name = "Gas Y"
+	dangerous = TRUE
+	gas_overlay = "gas_y"
+	moles_visible = MOLES_GAS_VISIBLE
+	rarity = 100
+
+/datum/gas/gas_z
+	id = "gas_z"
+	specific_heat = 900
+	name = "Gas Z"
+	dangerous = TRUE
+	gas_overlay = "gas_z"
+	moles_visible = MOLES_GAS_VISIBLE
+	rarity = 600
+
+/datum/gas/delta_gas
+	id = "delta_gas"
+	specific_heat = 150
+	name = "Delta gas"
+	dangerous = TRUE
+	gas_overlay = "delta_gas"
+	moles_visible = MOLES_GAS_VISIBLE
+	rarity = 100
+
+/datum/gas/gamma_gas
+	id = "gamma_gas"
+	specific_heat = 150
+	name = "Gamma gas"
+	dangerous = TRUE
+	gas_overlay = "gamma_gas"
+	moles_visible = MOLES_GAS_VISIBLE
+	rarity = 100
+
 /obj/effect/overlay/gas
 	icon = 'icons/effects/atmospherics.dmi'
 	mouse_opacity = MOUSE_OPACITY_TRANSPARENT