Updates to fantasy redgate

Added a room with a bigger vampire and good fantasy loot behind a locked door that can only be opened with a newly hidden key. Alongside a few turfs, mob and spawner to support this.

Fixed https://github.com/VOREStation/VOREStation/issues/15416 by adding sprites to open dungeon walls, other sprite fix was in a previous PR.

Added a note at the entrance of the redgate asking people to not bring weapons home.

code/game/objects/random/misc_vr.dm

@@ -342,3 +342,27 @@
 				prob(3);/obj/item/toy/eight_ball,
 				prob(3);/obj/item/device/perfect_tele/magic
 				)
+
+/obj/random/fantasy_item/better
+	name = "better random fantasy item"
+	desc = "A random fantasy item."
+	icon_state = "fantasy2"
+	spawn_nothing_percentage = 0
+
+/obj/random/fantasy_item/better/item_to_spawn()
+	return pick(prob(10);/obj/item/device/healthanalyzer/scroll,
+				prob(10);/obj/item/weapon/gun/energy/taser/magic,
+				prob(10);/obj/item/weapon/bluespace_harpoon/wand,
+				prob(10);/obj/item/device/slow_sizegun/magic,
+				prob(10);/obj/item/clothing/gloves/bluespace/magic,
+				prob(10);/obj/item/weapon/tool/wirecutters/alien/magic,
+				prob(10);/obj/item/weapon/tool/crowbar/alien/magic,
+				prob(10);/obj/item/weapon/tool/screwdriver/alien/magic,
+				prob(10);/obj/item/weapon/weldingtool/alien/magic,
+				prob(10);/obj/item/weapon/tool/wrench/alien/magic,
+				prob(10);/obj/item/weapon/surgical/bone_clamp/alien/magic,
+				prob(10);/obj/item/weapon/material/twohanded/staff,
+				prob(10);/obj/item/weapon/gun/energy/hooklauncher/ring,
+				prob(10);/obj/item/device/perfect_tele/magic,
+				prob(10);/obj/item/weapon/reagent_containers/glass/bottle/potion/truepolymorph
+				)