diff --git a/mods/lord/Core/helpers/src/lua_ext/table.lua b/mods/lord/Core/helpers/src/lua_ext/table.lua
index faa820746..75e2c71ff 100644
--- a/mods/lord/Core/helpers/src/lua_ext/table.lua
+++ b/mods/lord/Core/helpers/src/lua_ext/table.lua
@@ -22,16 +22,26 @@ function table.has_key(table, find_key)
 	return false
 end
 
+--- @overload fun(table1:table, table2:table):table
 --- @param table1 table
 --- @param table2 table
+--- @param overwrite boolean whether to overwrite the `table1` (default: false)
 --- @return table
-function table.merge(table1, table2)
-	local merged_table = table_copy(table1)
+function table.merge(table1, table2, overwrite)
+	overwrite = overwrite or false
+	local merged_table = overwrite and table1 or table_copy(table1)
 	for key, value in pairs(table2) do
 		merged_table[key] = value
 	end
 	return merged_table
 end
+local table_merge = table.merge
+
+--- @param table1 table
+--- @param table2 table
+function table.overwrite(table1, table2)
+	return table_merge(table1, table2, true)
+end
 
 --- @param table table
 --- @return boolean
diff --git a/mods/lord/_experimental/lord_bows/init.lua b/mods/lord/_experimental/lord_bows/init.lua
index 3e9c8a4c0..8870e11fe 100644
--- a/mods/lord/_experimental/lord_bows/init.lua
+++ b/mods/lord/_experimental/lord_bows/init.lua
@@ -4,19 +4,12 @@ GRAVITY = minetest.settings:get("movement_gravity") or 9.81
 dofile(minetest.get_modpath(minetest.get_current_modname()) .. "/entities_projectiles.lua")
 dofile(minetest.get_modpath(minetest.get_current_modname()) .. "/mechanics_throwing.lua")
 
-local function table_merge(t1, t2)
-	for k, v in pairs(t2) do
-		t1[k] = v
-	end
-	return t1
-end
-
 local stage_groups = {not_in_creative_inventory = 1}
 
 local function register_bow(name, def)
 	local wield_scale      = {x = 2, y = 2, z = 0.75}
 
-	local all_stage_groups = table_merge(stage_groups, def.groups)
+	local all_stage_groups = table.merge(stage_groups, def.groups)
 
 	minetest.register_tool(name, {
 		range             = 1,
diff --git a/mods/lord/lord_classes/init.lua b/mods/lord/lord_classes/init.lua
index 2f131b89e..2471b098d 100644
--- a/mods/lord/lord_classes/init.lua
+++ b/mods/lord/lord_classes/init.lua
@@ -1,3 +1,6 @@
+local table_has_key
+	= table.has_key
+
 local SL = minetest.get_translator("lord_classes")
 
 --[[
@@ -143,22 +146,13 @@ function races.save()
     return true
 end
 
-local function table_contains(t, v)
-	for k, _ in pairs(t) do
-		if k == v then
-			return true
-		end
-	end
-	return false
-end
-
 -- Validates {race, gender} tables
 -- Returns true if the table is valid, false otherwise
 function races.validate(race_and_gender)
 	local race = race_and_gender[1]
 	local gender = race_and_gender[2]
 
-	if table_contains(races.list, race) then
+	if table_has_key(races.list, race) then
 		if gender == "male" or gender == "female" then
 			return true
 		end
@@ -494,7 +488,7 @@ end)
 minetest.register_on_joinplayer(function(player)
 	local name = player:get_player_name()
 
-	if table_contains(cache.players, name) then  -- Player is registered already
+	if table_has_key(cache.players, name) then  -- Player is registered already
 		local r = races.get_race_and_gender(name)
 		if races.list[r[1]].cannot_be_selected then
 			races.show_change_form(name)
diff --git a/mods/lord/lord_replacer/init.lua b/mods/lord/lord_replacer/init.lua
index cb21b0a04..b00c385ce 100644
--- a/mods/lord/lord_replacer/init.lua
+++ b/mods/lord/lord_replacer/init.lua
@@ -1,3 +1,6 @@
+local table_has_value
+	= table.has_value
+
 local S = minetest.get_translator("lord_replacer")
 
 local DEFAULT_SELECTED_NODE = "default:dirt"
@@ -15,19 +18,6 @@ local REPLACER_IRREPLACEABLE = {
 }
 
 
---- Checks if a table has value.
----@param table table
----@param value any
----@return boolean @does table has given value
-local function table_has_value(table, value)
-	for _, v in ipairs(table) do
-		if v == value then
-			return true
-		end
-	end
-	return false
-end
-
 --- Sets replacer's selection using its metadata.
 ---@param itemstack ItemStack
 ---@param selected_node NodeTable @`minetest.get_node` format
diff --git a/mods/lord/lottinventory/cooking.lua b/mods/lord/lottinventory/cooking.lua
index efa5a72b0..75694b2e5 100644
--- a/mods/lord/lottinventory/cooking.lua
+++ b/mods/lord/lottinventory/cooking.lua
@@ -26,14 +26,6 @@ zcc.items_in_group = function(group)
 	return items
 end
 
-local table_copy   = function(table)
-	local out = {}
-	for k, v in pairs(table) do
-		out[k] = v
-	end
-	return out
-end
-
 zcc.add_craft      = function(input, output, groups)
 	if minetest.get_item_group(output, "forbidden") > 0 then
 		return
@@ -63,7 +55,7 @@ zcc.add_craft      = function(input, output, groups)
 						zcc.add_craft({
 							width = c.width,
 							type  = c.type,
-							items = table_copy(c.items)
+							items = table.copy(c.items)
 						}, output, g2) -- it is needed to copy the table, else groups won't work right
 					end
 					return
diff --git a/mods/lord/lottinventory/forbidden.lua b/mods/lord/lottinventory/forbidden.lua
index 651b5c416..1f015aedd 100644
--- a/mods/lord/lottinventory/forbidden.lua
+++ b/mods/lord/lottinventory/forbidden.lua
@@ -26,14 +26,6 @@ zfc.items_in_group = function(group)
 	return items
 end
 
-local table_copy = function(table)
-	local out = {}
-	for k,v in pairs(table) do
-		out[k] = v
-	end
-	return out
-end
-
 zfc.add_craft = function(input, output, groups)
 	if minetest.get_item_group(output, "forbidden") > 0 then
 	if not groups then groups = {} end
@@ -54,7 +46,7 @@ zfc.add_craft = function(input, output, groups)
 					zfc.add_craft({
 						width = c.width,
 						type = c.type,
-						items = table_copy(c.items)
+						items = table.copy(c.items)
 					}, output, g2) -- it is needed to copy the table, else groups won't work right
 				end
 				return
diff --git a/mods/lord/lottinventory/master.lua b/mods/lord/lottinventory/master.lua
index 814c90455..268f6e668 100644
--- a/mods/lord/lottinventory/master.lua
+++ b/mods/lord/lottinventory/master.lua
@@ -30,14 +30,6 @@ zmc.items_in_group = function(group)
 	return items
 end
 
-local table_copy = function(table)
-	local out = {}
-	for k,v in pairs(table) do
-		out[k] = v
-	end
-	return out
-end
-
 zmc.add_craft = function(input, output, groups)
 	if not groups then groups = {} end
 	local c = {}
@@ -57,7 +49,7 @@ zmc.add_craft = function(input, output, groups)
 					zmc.add_craft({
 						width = c.width,
 						type = c.type,
-						items = table_copy(c.items)
+						items = table.copy(c.items)
 					}, output, g2) -- it is needed to copy the table, else groups won't work right
 				end
 				return
diff --git a/mods/lord/lottinventory/protection.lua b/mods/lord/lottinventory/protection.lua
index 1c82b5359..b3ca5f158 100644
--- a/mods/lord/lottinventory/protection.lua
+++ b/mods/lord/lottinventory/protection.lua
@@ -26,14 +26,6 @@ zpc.items_in_group = function(group)
 	return items
 end
 
-local table_copy = function(table)
-	local out = {}
-	for k,v in pairs(table) do
-		out[k] = v
-	end
-	return out
-end
-
 zpc.add_craft = function(input, output, groups)
 	if minetest.get_item_group(output, "armor_use") > 0 or minetest.get_item_group(output, "armor_crafts") > 0 then
      if minetest.get_item_group(output, "forbidden") > 0 then
@@ -57,7 +49,7 @@ zpc.add_craft = function(input, output, groups)
 					zpc.add_craft({
 						width = c.width,
 						type = c.type,
-						items = table_copy(c.items)
+						items = table.copy(c.items)
 					}, output, g2) -- it is needed to copy the table, else groups won't work right
 				end
 				return
diff --git a/mods/lord/lottinventory/zcg.lua b/mods/lord/lottinventory/zcg.lua
index d477b1593..09e5f5070 100644
--- a/mods/lord/lottinventory/zcg.lua
+++ b/mods/lord/lottinventory/zcg.lua
@@ -30,14 +30,6 @@ zcg.items_in_group = function(group)
 	return items
 end
 
-local table_copy = function(table)
-	local out = {}
-	for k,v in pairs(table) do
-		out[k] = v
-	end
-	return out
-end
-
 zcg.add_craft = function(input, output, groups)
 	if minetest.get_item_group(output, "forbidden") > 0 then
 		return
@@ -69,7 +61,7 @@ zcg.add_craft = function(input, output, groups)
 					zcg.add_craft({
 						width = c.width,
 						type = c.type,
-						items = table_copy(c.items)
+						items = table.copy(c.items)
 					}, output, g2) -- it is needed to copy the table, else groups won't work right
 				end
 				return
diff --git a/mods/lord/mega_sl/init.lua b/mods/lord/mega_sl/init.lua
index 5676c6d89..67e0058ec 100644
--- a/mods/lord/mega_sl/init.lua
+++ b/mods/lord/mega_sl/init.lua
@@ -1,9 +1,5 @@
---- @param table table
----@return boolean
-local function table_is_empty(table)
-	for _,_ in pairs(table) do return false end -- luacheck: ignore
-	return true
-end
+local table_is_empty
+	= table.is_empty
 
 minetest.register_chatcommand ("S", {
 	description = "Сохранить данные в файл",
diff --git a/mods/lord/player/arena_health.lua b/mods/lord/player/arena_health.lua
index 137b5bf4f..57f5d8b0b 100644
--- a/mods/lord/player/arena_health.lua
+++ b/mods/lord/player/arena_health.lua
@@ -1,3 +1,6 @@
+local table_has_value
+	= table.has_value
+
 local ARENA_AREA_IDS = {}
 
 local arena_ids      = minetest.settings:get("arenas") or ""
@@ -27,13 +30,7 @@ local function player_undisplay_hp(player)
 	player:set_properties({nametag = name, nametag_color = "#FFFFFF",})
 end
 
--- TODO: move this functions into separate mod
-local table_indexOf = table.indexof
---- @param list table
---- @param value any
-local function table_has_value(list, value)
-	return table_indexOf(list, value) ~= -1
-end
+-- TODO: move this function into Core/helpers
 --- @param list table
 --- @param values table
 local function table_keys_has_one_of_values(list, values)
diff --git a/mods/lord/roads/init.lua b/mods/lord/roads/init.lua
index ff7858f1b..24be903e7 100644
--- a/mods/lord/roads/init.lua
+++ b/mods/lord/roads/init.lua
@@ -1,13 +1,6 @@
 local S = minetest.get_translator("roads")
 
 local function register_road(name, main_material, desc, fill) -- функция регистрации всех нодов дороги
-
-  local function table_concat(s,t) -- функция объединение таблиц
-    for i, v in pairs(t) do
-      s[i] = v
-    end
-  end
-
   local mn = "roads:"..name -- имя мода с материалом
   local road_name = mn.."_road" -- дорога
   local border_name = mn.."_border" -- бордюр
@@ -18,7 +11,7 @@ local function register_road(name, main_material, desc, fill) -- функция
   local border_item_name = mn.."_border_item" -- бордюр(итем)
 
   local sp_groups = {not_in_creative_inventory = 1} -- специальная группа
-  table_concat(sp_groups, desc.groups)
+  table.overwrite(sp_groups, desc.groups)
 
   -- textures: border_x, border_z, border_top, step_border_x,
   -- step_border_z, incorn_border_top, outcorn_border_top