diff --git a/data/campaigns/World_Conquest/Modding.md b/data/campaigns/World_Conquest/Modding.md
index a6f9bfbf1b4..ac938e1ec7c 100644
--- a/data/campaigns/World_Conquest/Modding.md
+++ b/data/campaigns/World_Conquest/Modding.md
@@ -246,6 +246,7 @@ World Conquest looks for `[world_conquest_data]` tags in the era and every loade
             image=attacks/wail.png
             name= _ "Blood Magic"
             dialogue= "You have found me, mortals? Well...let us show your recruits some blood magic!"
+            manual_invest = false #Setting manual_invest to false will hide a trainer from the invest screen. Not specifying this variable at all includes a new trainer by default.
             [grade]
             [/grade]
             [grade]
diff --git a/data/campaigns/World_Conquest/lua/game_mechanics/invest/invest.lua b/data/campaigns/World_Conquest/lua/game_mechanics/invest/invest.lua
index fbb71708ba9..dbfdabee943 100644
--- a/data/campaigns/World_Conquest/lua/game_mechanics/invest/invest.lua
+++ b/data/campaigns/World_Conquest/lua/game_mechanics/invest/invest.lua
@@ -137,7 +137,7 @@ function wc2_invest.invest()
 	local heroes_available = stringx.split(side.variables["wc2.heroes"] or "")
 	local commanders_available = stringx.split(side.variables["wc2.commanders"] or "")
 	local deserters_available = stringx.split(side.variables["wc2.deserters"] or "")
-	local trainings_available = wc2_training.list_available(side_num, {2,3,4,5,6})
+	local trainings_available = wc2_training.list_available(side_num)
 	local gold_available = true
 	for i = 1,2 do
 		local is_local = false
diff --git a/data/campaigns/World_Conquest/lua/game_mechanics/training.lua b/data/campaigns/World_Conquest/lua/game_mechanics/training.lua
index 6bd8b4cb892..659eb2294e1 100644
--- a/data/campaigns/World_Conquest/lua/game_mechanics/training.lua
+++ b/data/campaigns/World_Conquest/lua/game_mechanics/training.lua
@@ -85,20 +85,23 @@ function training.has_max_training(side_num, trainer, amount)
 	return training.available(side_num, trainer) == 0
 end
 
-function training.list_available(side_num, among, amount)
-	local av = among or wc2_utils.range(#training.get_list())
+function training.list_available(side_num, amount)
+	local av = wc2_utils.range(#training.get_list())
 	local res = {}
 	for i,v in ipairs(av) do
 		local j = tonumber(v)
-		if training.available(side_num, j, amount) then
-			table.insert(res, j)
+		local trainer = training.get_trainer(j)
+		if trainer and (trainer.manual_invest == nil or trainer.manual_invest == true) then
+			if training.available(side_num, j, amount) then
+				table.insert(res, j)
+			end
 		end
 	end
 	return res
 end
 
-function training.find_available(side_num, among, amount)
-	local possible_traintypes = training.list_available(side_num, among, amount)
+function training.find_available(side_num, amount)
+	local possible_traintypes = training.list_available(side_num, amount)
 	if #possible_traintypes == 0 then
 		return
 	else
@@ -192,16 +195,10 @@ end
 
 function training.pick_bonus(side_num)
 	local amount = training.bonus_calculate_amount(side_num)
-	-- dark training reduced chances
-	local traintype_index = training.find_available(side_num, {1,2,3,4,5,6,2,3,4,5,6,2,3,4,5,6}, amount)
+	local traintype_index = training.find_available(side_num, amount)
 	if traintype_index == nil then
 		return nil
 	end
-
-	--dark training increased level.
-	if traintype_index == 1 then
-		amount = math.min(training.trainings_left(side_num, traintype_index), math.max(amount, wc2_scenario.scenario_num() - 1))
-	end
 	return traintype_index, amount
 end
 
diff --git a/data/campaigns/World_Conquest/resources/data/training.cfg b/data/campaigns/World_Conquest/resources/data/training.cfg
index 46aa794d341..1df98c16e67 100644
--- a/data/campaigns/World_Conquest/resources/data/training.cfg
+++ b/data/campaigns/World_Conquest/resources/data/training.cfg
@@ -9,6 +9,7 @@
         image=attacks/curse.png
         name=_ "Dark"
         dialogue=_ "I haven’t lived centuries fighting others’ battles, but I could combat boredom teaching your men a couple of things about dark techniques."
+        manual_invest = false
         [grade]
         [/grade]
         [grade]