Works on New Blob

code/modules/blob2/blobs/core.dm

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+var/list/blob_cores = list()
+
+/obj/structure/blob/core
+	name = "blob core"
+	base_name = "core"
+	icon = 'icons/mob/blob.dmi'
+	icon_state = "blank_blob"
+	desc = "A huge, pulsating yellow mass."
+	max_integrity = 150
+	point_return = -1
+	health_regen = 0 //we regen in Life() instead of when pulsed
+	var/datum/blob_type/desired_blob_type = null // If this is set, the core always creates an overmind possessing this blob type.
+	var/difficulty_threshold = null // Otherwise if this is set, it picks a random blob_type that is equal or lower in difficulty.
+	var/core_regen = 2
+	var/overmind_get_delay = 0 //we don't want to constantly try to find an overmind, this var tracks when we'll try to get an overmind again
+	var/resource_delay = 0
+	var/point_rate = 2
+	var/ai_controlled = TRUE
+
+// Spawn this if you want a ghost to be able to play as the blob.
+/obj/structure/blob/core/player
+	ai_controlled = FALSE
+
+// Spawn these if you want a semi-random blob.
+/obj/structure/blob/core/random_easy
+	difficulty_threshold = BLOB_DIFFICULTY_EASY
+
+/obj/structure/blob/core/random_medium
+	difficulty_threshold = BLOB_DIFFICULTY_MEDIUM
+
+/obj/structure/blob/core/random_hard
+	difficulty_threshold = BLOB_DIFFICULTY_HARD
+
+// Spawn these if you want a specific blob.
+/obj/structure/blob/core/blazing_oil
+	desired_blob_type = /datum/blob_type/blazing_oil
+
+/obj/structure/blob/core/grey_goo
+	desired_blob_type = /datum/blob_type/grey_goo
+
+/obj/structure/blob/core/electromagnetic_web
+	desired_blob_type = /datum/blob_type/electromagnetic_web
+
+/obj/structure/blob/core/fungal_bloom
+	desired_blob_type = /datum/blob_type/fungal_bloom
+
+/obj/structure/blob/core/fulminant_organism
+	desired_blob_type = /datum/blob_type/fulminant_organism
+
+/obj/structure/blob/core/reactive_spines
+	desired_blob_type = /datum/blob_type/reactive_spines
+
+/obj/structure/blob/core/synchronous_mesh
+	desired_blob_type = /datum/blob_type/synchronous_mesh
+
+/obj/structure/blob/core/shifting_fragments
+	desired_blob_type = /datum/blob_type/shifting_fragments
+
+/obj/structure/blob/core/cryogenic_goo
+	desired_blob_type = /datum/blob_type/cryogenic_goo
+
+/obj/structure/blob/core/energized_jelly
+	desired_blob_type = /datum/blob_type/energized_jelly
+
+/obj/structure/blob/core/explosive_lattice
+	desired_blob_type = /datum/blob_type/explosive_lattice
+
+/obj/structure/blob/core/pressurized_slime
+	desired_blob_type = /datum/blob_type/pressurized_slime
+
+/obj/structure/blob/core/radioactive_ooze
+	desired_blob_type = /datum/blob_type/radioactive_ooze
+
+/obj/structure/blob/core/classic
+	desired_blob_type = /datum/blob_type/classic
+
+/obj/structure/blob/core/New(var/newloc, var/client/new_overmind = null, new_rate = 2, placed = 0)
+	..(newloc)
+	blob_cores += src
+	processing_objects += src
+	update_icon() //so it atleast appears
+	if(!placed && !overmind)
+		create_overmind(new_overmind)
+	if(overmind)
+		update_icon()
+	point_rate = new_rate
+
+/obj/structure/blob/core/Destroy()
+	blob_cores -= src
+	if(overmind)
+		overmind.blob_core = null
+		qdel(overmind)
+	overmind = null
+	processing_objects -= src
+	return ..()
+
+/obj/structure/blob/core/update_icon()
+	overlays.Cut()
+	color = null
+	var/mutable_appearance/blob_overlay = mutable_appearance('icons/mob/blob.dmi', "blob")
+	if(overmind)
+		blob_overlay.color = overmind.blob_type.color
+		name = "[overmind.blob_type.name] [base_name]"
+	overlays += blob_overlay
+	overlays += mutable_appearance('icons/mob/blob.dmi', "blob_core_overlay")
+
+/obj/structure/blob/core/process()
+	set waitfor = FALSE
+	if(QDELETED(src))
+		return
+	if(!overmind)
+		spawn(0)
+			create_overmind()
+	else
+		if(resource_delay <= world.time)
+			resource_delay = world.time + 1 SECOND
+			overmind.add_points(point_rate)
+	integrity = min(max_integrity, integrity + core_regen)
+//	if(overmind)
+//		overmind.update_health_hud()
+	pulse_area(overmind, 15, BLOB_CORE_PULSE_RANGE, BLOB_CORE_EXPAND_RANGE)
+	for(var/obj/structure/blob/normal/B in range(1, src))
+		if(prob(5))
+			B.change_to(/obj/structure/blob/shield/core, overmind)
+
+/obj/structure/blob/core/proc/create_overmind(client/new_overmind, override_delay)
+	if(overmind_get_delay > world.time && !override_delay)
+		return
+	if(!ai_controlled) // Do we want a bona fide player blob?
+		overmind_get_delay = world.time + 15 SECONDS //if this fails, we'll try again in 15 seconds
+
+		if(overmind)
+			qdel(overmind)
+
+
+		var/client/C = null
+		if(!new_overmind)
+			var/datum/ghost_query/Q = new /datum/ghost_query/blob()
+			var/list/winner = Q.query()
+			if(winner.len)
+				var/mob/observer/dead/D = winner[1]
+				C = D.client
+
+		else
+			C = new_overmind
+
+		if(C)
+			if(!desired_blob_type && !isnull(difficulty_threshold))
+				desired_blob_type = get_random_blob_type()
+			var/mob/observer/blob/B = new(loc, TRUE, 60, desired_blob_type)
+			B.key = C.key
+			B.blob_core = src
+			src.overmind = B
+			update_icon()
+			if(B.mind && !B.mind.special_role)
+				B.mind.special_role = "Blob Overmind"
+			return TRUE
+		return FALSE
+
+	else // An AI opponent.
+		if(!desired_blob_type && !isnull(difficulty_threshold))
+			desired_blob_type = get_random_blob_type()
+		var/mob/observer/blob/B = new(loc, TRUE, 60, desired_blob_type)
+		overmind = B
+		B.blob_core = src
+		B.ai_controlled = TRUE
+		update_icon()
+		return TRUE
+
+/obj/structure/blob/core/proc/get_random_blob_type()
+	if(!difficulty_threshold)
+		return
+	var/list/valid_types = list()
+	for(var/thing in subtypesof(/datum/blob_type))
+		var/datum/blob_type/BT = thing
+		if(initial(BT.difficulty) > difficulty_threshold)
+			continue
+		valid_types += BT
+	return pick(valid_types)