diff --git a/code/modules/mapping/mapping_helpers.dm b/code/modules/mapping/mapping_helpers.dm
index 75d3e210923..86b2c404bd8 100644
--- a/code/modules/mapping/mapping_helpers.dm
+++ b/code/modules/mapping/mapping_helpers.dm
@@ -579,13 +579,68 @@ INITIALIZE_IMMEDIATE(/obj/effect/mapping_helpers/no_lava)
 /obj/effect/mapping_helpers/ztrait_injector
 	name = "ztrait injector"
 	icon_state = "ztrait"
+	late = TRUE
 	/// List of traits to add to this Z-level.
 	var/list/traits_to_add = list()
 
-/obj/effect/mapping_helpers/ztrait_injector/Initialize()
-	. = ..()
+/obj/effect/mapping_helpers/ztrait_injector/LateInitialize()
 	var/datum/space_level/level = SSmapping.z_list[z]
 	if(!level || !length(traits_to_add))
 		return
 	level.traits |= traits_to_add
 	SSweather.update_z_level(level) //in case of someone adding a weather for the level, we want SSweather to update for that
+
+/obj/effect/mapping_helpers/circuit_spawner
+	name = "circuit spawner"
+	icon_state = "circuit"
+	/// The shell for the circuit.
+	var/atom/movable/circuit_shell
+	/// Capacity of the shell.
+	var/shell_capacity = SHELL_CAPACITY_VERY_LARGE
+	/// The url for the json. Example: "https://pastebin.com/raw/eH7VnP9d"
+	var/json_url
+
+/obj/effect/mapping_helpers/circuit_spawner/Initialize(mapload)
+	. = ..()
+	INVOKE_ASYNC(src, .proc/spawn_circuit)
+
+/obj/effect/mapping_helpers/circuit_spawner/proc/spawn_circuit()
+	var/list/errors = list()
+	var/obj/item/integrated_circuit/loaded/new_circuit = new(loc)
+	var/json_data = load_data()
+	new_circuit.load_circuit_data(json_data, errors)
+	if(!circuit_shell)
+		return
+	circuit_shell = new(loc)
+	var/datum/component/shell/shell_component = circuit_shell.GetComponent(/datum/component/shell)
+	if(shell_component)
+		shell_component.shell_flags |= SHELL_FLAG_CIRCUIT_UNMODIFIABLE|SHELL_FLAG_CIRCUIT_UNREMOVABLE
+		shell_component.attach_circuit(new_circuit)
+	else
+		shell_component = circuit_shell.AddComponent(/datum/component/shell, \
+			capacity = shell_capacity, \
+			shell_flags = SHELL_FLAG_CIRCUIT_UNMODIFIABLE|SHELL_FLAG_CIRCUIT_UNREMOVABLE, \
+			starting_circuit = new_circuit, \
+			)
+
+/obj/effect/mapping_helpers/circuit_spawner/proc/load_data()
+	var/static/json_cache = list()
+	var/static/query_in_progress = FALSE //We're using a single tmp file so keep it linear.
+	if(query_in_progress)
+		UNTIL(!query_in_progress)
+	if(json_cache[json_url])
+		return json_cache[json_url]
+	log_asset("Circuit Spawner fetching json from: [json_url]")
+	var/datum/http_request/request = new()
+	request.prepare(RUSTG_HTTP_METHOD_GET, json_url, "")
+	query_in_progress = TRUE
+	request.begin_async()
+	UNTIL(request.is_complete())
+	var/datum/http_response/response = request.into_response()
+	if(response.errored || response.status_code != 200)
+		query_in_progress = FALSE
+		CRASH("Failed to fetch mapped custom json from url [json_url], code: [response.status_code], error: [response.error]")
+	var/json_data = response["body"]
+	json_cache[json_url] = json_data
+	query_in_progress = FALSE
+	return json_data
diff --git a/code/modules/unit_tests/create_and_destroy.dm b/code/modules/unit_tests/create_and_destroy.dm
index 66b478a0004..64f8d1267f5 100644
--- a/code/modules/unit_tests/create_and_destroy.dm
+++ b/code/modules/unit_tests/create_and_destroy.dm
@@ -23,6 +23,8 @@
 		/obj/structure/holosign/robot_seat,
 		//Singleton
 		/mob/dview,
+		//Requires a circuit url
+		/obj/effect/mapping_helpers/circuit_spawner,
 	)
 	//Say it with me now, type template
 	ignore += typesof(/obj/effect/mapping_helpers/atom_injector)
diff --git a/icons/effects/mapping_helpers.dmi b/icons/effects/mapping_helpers.dmi
index bdfdd6b199d..ea9170818f0 100644
Binary files a/icons/effects/mapping_helpers.dmi and b/icons/effects/mapping_helpers.dmi differ