apocalypse fix

config.lua

@@ -357,7 +357,9 @@ global.config = {
     },
     -- enables a command which allows for an end-game event
     apocalypse = {
-        enabled = true
+        enabled = true,
+        -- chance behemoth biters and spitters will double on death.
+        duplicate_chance = 0.05
     },
     -- gradually informs players of features such as chat, toasts, etc.
     player_onboarding = {

features/apocalypse.lua

@@ -5,15 +5,13 @@ local Global = require 'utils.global'
 local Command = require 'utils.command'
 local Toast = require 'features.gui.toast'
 local RS = require 'map_gen.shared.redmew_surface'
-local HailHydra = require 'map_gen.shared.hail_hydra'
 local Color = require 'resources.color_presets'
 local Ranks = require 'resources.ranks'
+local Event = require 'utils.event'
+local random = math.random
+local Config = require 'config'
 
--- Constants
-local hail_hydra_data = {
-    ['behemoth-spitter'] = {['behemoth-spitter'] = 0.01},
-    ['behemoth-biter'] = {['behemoth-biter'] = 0.01}
-}
+local duplicate_chance = Config.apocalypse.duplicate_chance
 
 -- Local var
 local Public = {}
@@ -35,6 +33,54 @@ Global.register(
     end
 )
 
+local name_map = {['behemoth-biter'] = true, ['behemoth-spitter'] = true}
+
+local biter_died_token =
+    Token.register(
+    function(event)
+        local entity = event.entity
+        if not entity.valid then
+            return
+        end
+
+        local name = entity.name
+        if not name_map[name] then
+            return
+        end
+
+        local force_name = entity.force.name
+        if force_name ~= 'enemy' then
+            return
+        end
+
+        local surface = entity.surface
+        local create_entity = surface.create_entity
+        local position = entity.position
+        local spawn = {name = entity.name, force = 'enemy', position = position}
+
+        create_entity(spawn)
+
+        if random() > duplicate_chance then
+            return
+        end
+
+        local spawn_position = surface.find_non_colliding_position(name, position, 8, 1)
+        if not spawn_position then
+            return
+        end
+
+        spawn.position = spawn_position
+        create_entity(spawn)
+    end
+)
+
+local aliens = {
+    'behemoth-biter',
+    'behemoth-biter',
+    'behemoth-spitter',
+    'behemoth-spitter'
+}
+
 local biter_spawn_token =
     Token.register(
     function()
@@ -45,9 +91,6 @@ local biter_spawn_token =
         surface = RS.get_surface()
         player_force = game.forces.player
 
-        HailHydra.set_hydras(hail_hydra_data)
-        HailHydra.set_evolution_scale(1)
-        HailHydra.enable_hail_hydra()
         enemy_force.evolution_factor = 1
 
         local p_spawn = player_force.get_spawn_position(surface)
@@ -55,13 +98,6 @@ local biter_spawn_token =
 
         local create_entity = surface.create_entity
 
-        local aliens = {
-            'behemoth-biter',
-            'behemoth-biter',
-            'behemoth-spitter',
-            'behemoth-spitter'
-        }
-
         for i = 1, #aliens do
             local spawn_pos = surface.find_non_colliding_position('behemoth-biter', p_spawn, 300, 1)
             if spawn_pos then
@@ -72,6 +108,8 @@ local biter_spawn_token =
 
         group.set_command({type = defines.command.attack_area, destination = {0, 0}, radius = 500})
         Toast.toast_all_players(500, {'apocalypse.toast_message'})
+
+        Event.add_removable(defines.events.on_entity_died, biter_died_token)
     end
 )
 
@@ -97,7 +135,7 @@ function Public.begin_apocalypse(_, player)
 
     primitives.apocalypse_now = true
     game.print({'apocalypse.apocalypse_begins'}, Color.pink)
-    Task.set_timeout(15, biter_spawn_token, {})
+    Task.set_timeout(1, biter_spawn_token, {})
 end
 
 Command.add(