diff --git a/.luacheckrc b/.luacheckrc
index f36a4a37b..556b2e8f0 100644
--- a/.luacheckrc
+++ b/.luacheckrc
@@ -12,7 +12,7 @@ read_globals = {
 	"dump", "dump2",
 	"vector",
 	"VoxelManip", "VoxelArea",
-	"PseudoRandom", "PcgRandom", "PerlinNoise",
+	"PseudoRandom", "PcgRandom", "PerlinNoise", "PerlinNoiseMap",
 	"ItemStack",
 	"Settings",
 	"unpack",
diff --git a/mods/ITEMS/mcl_potions/init.lua b/mods/ITEMS/mcl_potions/init.lua
index 65bb0d4de..6cfa0dc50 100644
--- a/mods/ITEMS/mcl_potions/init.lua
+++ b/mods/ITEMS/mcl_potions/init.lua
@@ -25,11 +25,9 @@ dofile(modpath .. "/lingering.lua")
 dofile(modpath .. "/tipped_arrow.lua")
 dofile(modpath .. "/potions.lua")
 
-local brewhelp = S("Try different combinations to create potions.")
-
 minetest.register_craftitem("mcl_potions:fermented_spider_eye", {
 	description = S("Fermented Spider Eye"),
-	_doc_items_longdesc = brewhelp,
+	_doc_items_longdesc = S("Try different combinations to create potions."),
 	wield_image = "mcl_potions_spider_eye_fermented.png",
 	inventory_image = "mcl_potions_spider_eye_fermented.png",
 	groups = { brewitem = 1, },
@@ -65,14 +63,12 @@ minetest.register_craftitem("mcl_potions:glass_bottle", {
 
 			-- Try to fill glass bottle with water
 			local get_water = false
-			local from_liquid_source = false
+			--local from_liquid_source = false
 			local river_water = false
-			if not def then
-				-- Unknown node: no-op
-			elseif def.groups and def.groups.water and def.liquidtype == "source" then
+			if def and def.groups and def.groups.water and def.liquidtype == "source" then
 				-- Water source
 				get_water = true
-				from_liquid_source = true
+				--from_liquid_source = true
 				river_water = node.name == "mclx_core:river_water_source"
 			-- Or reduce water level of cauldron by 1
 			elseif string.sub(node.name, 1, 14) == "mcl_cauldrons:" then
@@ -440,7 +436,6 @@ function mcl_potions.get_alchemy(ingr, pot)
 		if brew_table[ingr] ~= nil then
 			return brew_table[ingr]
 		end
-		
 	end
 
 	if mod_table[ingr] ~= nil then
diff --git a/mods/ITEMS/mcl_potions/potions.lua b/mods/ITEMS/mcl_potions/potions.lua
index 4a82348e5..2d76a217b 100644
--- a/mods/ITEMS/mcl_potions/potions.lua
+++ b/mods/ITEMS/mcl_potions/potions.lua
@@ -1,5 +1,5 @@
 local S = minetest.get_translator("mcl_potions")
-local brewhelp = S("Try different combinations to create potions.")
+--local brewhelp = S("Try different combinations to create potions.")
 
 local potion_image = function(colorstring, opacity)
 	if not opacity then
@@ -98,7 +98,7 @@ local function register_potion(def)
 			end
 		elseif def.name == "healing" or def.name == "harming" then
 				_tt = S("@1 HP", effect)
- 		else
+		else
 			_tt = tt or time_string(dur) or S("No effect")
 		end
 		return _tt
diff --git a/mods/ITEMS/mcl_potions/splash.lua b/mods/ITEMS/mcl_potions/splash.lua
index bea07b8cf..f986134d6 100644
--- a/mods/ITEMS/mcl_potions/splash.lua
+++ b/mods/ITEMS/mcl_potions/splash.lua
@@ -123,6 +123,6 @@ function mcl_potions.register_splash(name, descr, color, def)
 	})
 end
 
-local function time_string(dur)
+--[[local function time_string(dur)
 	return math.floor(dur/60)..string.format(":%02d",math.floor(dur % 60))
-end
+end]]
diff --git a/mods/ITEMS/mcl_potions/tipped_arrow.lua b/mods/ITEMS/mcl_potions/tipped_arrow.lua
index 860019e8a..abeae8106 100644
--- a/mods/ITEMS/mcl_potions/tipped_arrow.lua
+++ b/mods/ITEMS/mcl_potions/tipped_arrow.lua
@@ -4,12 +4,12 @@ local ARROW_TIMEOUT = 60
 -- Time after which stuck arrow is rechecked for being stuck
 local STUCK_RECHECK_TIME = 5
 
-local GRAVITY = 9.81
+--local GRAVITY = 9.81
 
 local YAW_OFFSET = -math.pi/2
 
 local dir_to_pitch = function(dir)
-	local dir2 = vector.normalize(dir)
+	--local dir2 = vector.normalize(dir)
 	local xz = math.abs(dir.x) + math.abs(dir.z)
 	return -math.atan2(-dir.y, xz)
 end
@@ -197,7 +197,6 @@ function mcl_potions.register_arrow(name, desc, color, def)
 					glow = 1,
 				})
 			end
-			
 			-- We just check for any hurtable objects nearby.
 			-- The radius of 3 is fairly liberal, but anything lower than than will cause
 			-- arrow to hilariously go through mobs often.
@@ -360,7 +359,7 @@ function mcl_potions.register_arrow(name, desc, color, def)
 				if not v then
 					v = 0
 				end
-				local old_v = self._viscosity
+				--local old_v = self._viscosity
 				self._viscosity = v
 				local vpenalty = math.max(0.1, 0.98 - 0.1 * v)
 				if math.abs(vel.x) > 0.001 then
diff --git a/mods/ITEMS/mcl_signs/init.lua b/mods/ITEMS/mcl_signs/init.lua
index e053c6e82..be9db2fee 100644
--- a/mods/ITEMS/mcl_signs/init.lua
+++ b/mods/ITEMS/mcl_signs/init.lua
@@ -93,7 +93,7 @@ local generate_line = function(s, ypos)
 	local chars = 0
 	local printed_char_width = CHAR_WIDTH + 1
 	while chars < LINE_LENGTH and i <= #s do
-		local file = nil
+		local file
 		-- Get and render character
 		if charmap[s:sub(i, i)] ~= nil then
 			file = charmap[s:sub(i, i)]
@@ -185,7 +185,7 @@ local function get_wall_signtext_info(param2, nodename)
 	end
 end
 
-local sign_groups = {handy=1,axey=1, flammable=1, deco_block=1, material_wood=1, attached_node=1, dig_by_piston=1, flammable=-1}
+local sign_groups = {handy=1,axey=1, deco_block=1, material_wood=1, attached_node=1, dig_by_piston=1, flammable=-1}
 
 local destruct_sign = function(pos)
 	local objects = minetest.get_objects_inside_radius(pos, 0.5)
@@ -322,7 +322,7 @@ minetest.register_node("mcl_signs:wall_sign", {
 
 		local wdir = minetest.dir_to_wallmounted(dir)
 
-		local placer_pos = placer:get_pos()
+		--local placer_pos = placer:get_pos()
 
 		local fdir = minetest.dir_to_facedir(dir)
 
diff --git a/mods/ITEMS/mcl_stairs/api.lua b/mods/ITEMS/mcl_stairs/api.lua
index aecf10836..cca54226f 100644
--- a/mods/ITEMS/mcl_stairs/api.lua
+++ b/mods/ITEMS/mcl_stairs/api.lua
@@ -20,7 +20,7 @@ local function place_slab_normal(itemstack, placer, pointed_thing)
 	local p0 = pointed_thing.under
 	local p1 = pointed_thing.above
 
-	local placer_pos = placer:get_pos()
+	--local placer_pos = placer:get_pos()
 
 	local fpos = get_fpos(placer, pointed_thing)
 
@@ -179,7 +179,7 @@ end
 
 
 -- Slab facedir to placement 6d matching table
-local slab_trans_dir = {[0] = 8, 0, 2, 1, 3, 4}
+--local slab_trans_dir = {[0] = 8, 0, 2, 1, 3, 4}
 
 -- Register slabs.
 -- Node will be called mcl_stairs:slab_<subname>
@@ -268,6 +268,7 @@ function mcl_stairs.register_slab(subname, recipeitem, groups, images, descripti
 			end
 		end,
 		_mcl_hardness = hardness,
+		_mcl_blast_resistance = blast_resistance,
 		_mcl_other_slab_half = upper_slab,
 		on_rotate = function(pos, node, user, mode, param2)
 			-- Flip slab
@@ -331,6 +332,7 @@ function mcl_stairs.register_slab(subname, recipeitem, groups, images, descripti
 		sounds = sounds,
 		drop = lower_slab .. " 2",
 		_mcl_hardness = hardness,
+		_mcl_blast_resistance = blast_resistance,
 	})
 
 	if recipeitem then
diff --git a/mods/ITEMS/mcl_throwing/register.lua b/mods/ITEMS/mcl_throwing/register.lua
index 3d8cc94cf..c2af9717f 100644
--- a/mods/ITEMS/mcl_throwing/register.lua
+++ b/mods/ITEMS/mcl_throwing/register.lua
@@ -224,7 +224,7 @@ local pearl_on_step = function(self, dtime)
 						lv, ld = math.abs(vc.x), "x"
 					end
 					if math.abs(vc.z) > lv then
-						lv, ld = math.abs(vc.z), "z"
+						ld = "z" --math.abs(vc.z)
 					end
 					if ld ~= "x" then vc.x = 0 end
 					if ld ~= "y" then vc.y = 0 end
diff --git a/mods/ITEMS/mcl_torches/api.lua b/mods/ITEMS/mcl_torches/api.lua
index 304488805..c98bda3d9 100644
--- a/mods/ITEMS/mcl_torches/api.lua
+++ b/mods/ITEMS/mcl_torches/api.lua
@@ -30,7 +30,7 @@ local spawn_flames_floor = function(pos)
 end
 
 local spawn_flames_wall = function(pos)
-	local minrelpos, maxrelpos
+	--local minrelpos, maxrelpos
 	local node = minetest.get_node(pos)
 	local dir = minetest.wallmounted_to_dir(node.param2)
 
diff --git a/mods/MAPGEN/mcl_dungeons/init.lua b/mods/MAPGEN/mcl_dungeons/init.lua
index 928faaa11..58e23b12e 100644
--- a/mods/MAPGEN/mcl_dungeons/init.lua
+++ b/mods/MAPGEN/mcl_dungeons/init.lua
@@ -49,12 +49,12 @@ local dungeonsizes = {
 	{ x=7, y=4, z=7},
 }
 
-local dirs = {
+--[[local dirs = {
 	{ x= 1, y=0, z= 0 },
 	{ x= 0, y=0, z= 1 },
 	{ x=-1, y=0, z= 0 },
 	{ x= 0, y=0, z=-1 },
-}
+}]]
 
 local surround_vectors = {
 	{ x=-1, y=0, z=0 },
@@ -66,7 +66,7 @@ local surround_vectors = {
 local function ecb_spawn_dungeon(blockpos, action, calls_remaining, param)
 	if calls_remaining >= 1 then return end
 
-	local p1, p2, dim, pr = param.p1, param.p2, param.dim, param.pr
+	local p1, _, dim, pr = param.p1, param.p2, param.dim, param.pr
 	local x, y, z = p1.x, p1.y, p1.z
 	local check = not (param.dontcheck or false)
 
@@ -404,8 +404,7 @@ local function dungeons_nodes(minp, maxp, blockseed)
 		local p1 = {x=x,y=y,z=z}
 		local p2 = {x = x+dim.x+1, y = y+dim.y+1, z = z+dim.z+1}
 		minetest.log("verbose","[mcl_dungeons] size=" ..minetest.pos_to_string(dim) .. ", emerge from "..minetest.pos_to_string(p1) .. " to " .. minetest.pos_to_string(p2))
-		local param = {p1=p1, p2=p2, dim=dim, pr=pr}
-		emerge_area(p1, p2, ecb_spawn_dungeon, param)
+		emerge_area(p1, p2, ecb_spawn_dungeon, {p1=p1, p2=p2, dim=dim, pr=pr})
 	end
 end
 
@@ -414,8 +413,7 @@ function mcl_dungeons.spawn_dungeon(p1, _, pr)
 	local dim = dungeonsizes[pr:next(1, #dungeonsizes)]
 	local p2 = {x = p1.x+dim.x+1, y = p1.y+dim.y+1, z = p1.z+dim.z+1}
 	minetest.log("verbose","[mcl_dungeons] size=" ..minetest.pos_to_string(dim) .. ", emerge from "..minetest.pos_to_string(p1) .. " to " .. minetest.pos_to_string(p2))
-	local param = {p1=p1, p2=p2, dim=dim, pr=pr, dontcheck=true}
-	emerge_area(p1, p2, ecb_spawn_dungeon, param)
+	emerge_area(p1, p2, ecb_spawn_dungeon, {p1=p1, p2=p2, dim=dim, pr=pr, dontcheck=true})
 end
 
 mcl_mapgen_core.register_generator("dungeons", nil, dungeons_nodes, 999999)
diff --git a/mods/MAPGEN/mcl_mapgen_core/init.lua b/mods/MAPGEN/mcl_mapgen_core/init.lua
index 1ee861e4a..90b272506 100644
--- a/mods/MAPGEN/mcl_mapgen_core/init.lua
+++ b/mods/MAPGEN/mcl_mapgen_core/init.lua
@@ -65,21 +65,21 @@ local c_dirt = minetest.get_content_id("mcl_core:dirt")
 local c_dirt_with_grass = minetest.get_content_id("mcl_core:dirt_with_grass")
 local c_dirt_with_grass_snow = minetest.get_content_id("mcl_core:dirt_with_grass_snow")
 local c_sand = minetest.get_content_id("mcl_core:sand")
-local c_sandstone = minetest.get_content_id("mcl_core:sandstone")
+--local c_sandstone = minetest.get_content_id("mcl_core:sandstone")
 local c_void = minetest.get_content_id("mcl_core:void")
 local c_lava = minetest.get_content_id("mcl_core:lava_source")
 local c_water = minetest.get_content_id("mcl_core:water_source")
 local c_soul_sand = minetest.get_content_id("mcl_nether:soul_sand")
 local c_netherrack = minetest.get_content_id("mcl_nether:netherrack")
 local c_nether_lava = minetest.get_content_id("mcl_nether:nether_lava_source")
-local c_end_stone = minetest.get_content_id("mcl_end:end_stone")
+--local c_end_stone = minetest.get_content_id("mcl_end:end_stone")
 local c_realm_barrier = minetest.get_content_id("mcl_core:realm_barrier")
 local c_top_snow = minetest.get_content_id("mcl_core:snow")
 local c_snow_block = minetest.get_content_id("mcl_core:snowblock")
 local c_clay = minetest.get_content_id("mcl_core:clay")
 local c_leaves = minetest.get_content_id("mcl_core:leaves")
 local c_jungleleaves = minetest.get_content_id("mcl_core:jungleleaves")
-local c_jungletree = minetest.get_content_id("mcl_core:jungletree")
+--local c_jungletree = minetest.get_content_id("mcl_core:jungletree")
 local c_cocoa_1 = minetest.get_content_id("mcl_cocoas:cocoa_1")
 local c_cocoa_2 = minetest.get_content_id("mcl_cocoas:cocoa_2")
 local c_cocoa_3 = minetest.get_content_id("mcl_cocoas:cocoa_3")
@@ -1169,13 +1169,13 @@ end
 -- minp and maxp (from an on_generated callback) and returns the real world coordinates
 -- as X, Z.
 -- Inverse function of xz_to_biomemap
-local biomemap_to_xz = function(index, minp, maxp)
+--[[local biomemap_to_xz = function(index, minp, maxp)
 	local xwidth = maxp.x - minp.x + 1
 	local zwidth = maxp.z - minp.z + 1
 	local x = ((index-1) % xwidth) + minp.x
 	local z = ((index-1) / zwidth) + minp.z
 	return x, z
-end
+end]]
 
 -- Takes x and z coordinates and minp and maxp of a generated chunk
 -- (in on_generated callback) and returns a biomemap index)
@@ -1897,7 +1897,7 @@ function mcl_mapgen_core.unregister_generator(id)
 	local rec = registered_generators[id]
 	registered_generators[id] = nil
 	if rec.vf then lvm = lvm - 1 end
-	if rev.nf then nodes = nodes - 1 end
+	if rec.nf then nodes = nodes - 1 end
 	if rec.needs_param2 then param2 = param2 - 1 end
 	if rec.needs_level0 then level0 = level0 - 1 end
 end
@@ -1979,7 +1979,7 @@ end
 
 -- Below the bedrock, generate air/void
 local function basic(vm, data, data2, emin, emax, area, minp, maxp, blockseed)
-	local biomemap, ymin, ymax
+	local biomemap --ymin, ymax
 	local lvm_used = false
 	local pr = PseudoRandom(blockseed)
 
@@ -2077,7 +2077,7 @@ local function basic(vm, data, data2, emin, emax, area, minp, maxp, blockseed)
 					local n = nodes[n]
 					local p_pos = area:index(n.x, n.y, n.z)
 					local p_pos_above = area:index(n.x, n.y+1, n.z)
-					local p_pos_below = area:index(n.x, n.y-1, n.z)
+					--local p_pos_below = area:index(n.x, n.y-1, n.z)
 					local b_pos = aream:index(n.x, 0, n.z)
 					local bn = minetest.get_biome_name(biomemap[b_pos])
 					if bn then
@@ -2126,7 +2126,7 @@ local function basic(vm, data, data2, emin, emax, area, minp, maxp, blockseed)
 		-- * Remove stone, sand, dirt in v6 so our End map generator works in v6.
 		-- * Generate spawn platform (End portal destination)
 		elseif minp.y <= mcl_vars.mg_end_max and maxp.y >= mcl_vars.mg_end_min then
-			local nodes, n
+			local nodes
 			if mg_name == "v6" then
 				nodes = minetest.find_nodes_in_area(emin, emax, {"mcl_core:water_source", "mcl_core:stone", "mcl_core:sand", "mcl_core:dirt"})
 			else
@@ -2134,7 +2134,7 @@ local function basic(vm, data, data2, emin, emax, area, minp, maxp, blockseed)
 			end
 			if #nodes > 0 then
 				lvm_used = true
-				for _, n in pairs(nodes) do
+				for _,n in pairs(nodes) do
 					data[area:index(n.x, n.y, n.z)] = c_air
 				end
 			end
@@ -2144,8 +2144,8 @@ local function basic(vm, data, data2, emin, emax, area, minp, maxp, blockseed)
 				minp.x <= mcl_vars.mg_end_platform_pos.x and maxp.x >= mcl_vars.mg_end_platform_pos.z and
 				minp.z <= mcl_vars.mg_end_platform_pos.z and maxp.z >= mcl_vars.mg_end_platform_pos.z then
 
-				local pos1 = {x = math.max(minp.x, mcl_vars.mg_end_platform_pos.x-2), y = math.max(minp.y, mcl_vars.mg_end_platform_pos.y),   z = math.max(minp.z, mcl_vars.mg_end_platform_pos.z-2)}
-				local pos2 = {x = math.min(maxp.x, mcl_vars.mg_end_platform_pos.x+2), y = math.min(maxp.y, mcl_vars.mg_end_platform_pos.y+2), z = math.min(maxp.z, mcl_vars.mg_end_platform_pos.z+2)}
+				--local pos1 = {x = math.max(minp.x, mcl_vars.mg_end_platform_pos.x-2), y = math.max(minp.y, mcl_vars.mg_end_platform_pos.y),   z = math.max(minp.z, mcl_vars.mg_end_platform_pos.z-2)}
+				--local pos2 = {x = math.min(maxp.x, mcl_vars.mg_end_platform_pos.x+2), y = math.min(maxp.y, mcl_vars.mg_end_platform_pos.y+2), z = math.min(maxp.z, mcl_vars.mg_end_platform_pos.z+2)}
 
 				for x=math.max(minp.x, mcl_vars.mg_end_platform_pos.x-2), math.min(maxp.x, mcl_vars.mg_end_platform_pos.x+2) do
 				for z=math.max(minp.z, mcl_vars.mg_end_platform_pos.z-2), math.min(maxp.z, mcl_vars.mg_end_platform_pos.z+2) do