diff --git a/mods/ITEMS/mcl_core/nodes.lua b/mods/ITEMS/mcl_core/nodes.lua
index a709b53b..ba819e0e 100644
--- a/mods/ITEMS/mcl_core/nodes.lua
+++ b/mods/ITEMS/mcl_core/nodes.lua
@@ -1638,7 +1638,7 @@ minetest.register_node("mcl_core:lava_flowing", {
 	liquid_range = 4,
 	damage_per_second = 4*2,
 	post_effect_color = {a=192, r=255, g=64, b=0},
-	groups = { lava=3, liquid=2, igniter=3, destroys_items=1, not_in_creative_inventory=1, dig_by_piston=1},
+	groups = { lava=3, liquid=2, destroys_items=1, not_in_creative_inventory=1, dig_by_piston=1},
 	_mcl_blast_resistance = 500,
 	-- Hardness intentionally set to infinite instead of 100 (Minecraft value) to avoid problems in creative mode
 	_mcl_hardness = -1,
@@ -1679,7 +1679,7 @@ minetest.register_node("mcl_core:lava_source", {
 	damage_per_second = 4*2,
 	post_effect_color = {a=192, r=255, g=64, b=0},
 	stack_max = 64,
-	groups = { lava=3, liquid=2, igniter=3, destroys_items=1, not_in_creative_inventory=1, dig_by_piston=1},
+	groups = { lava=3, liquid=2, destroys_items=1, not_in_creative_inventory=1, dig_by_piston=1},
 	_mcl_blast_resistance = 500,
 	-- Hardness intentionally set to infinite instead of 100 (Minecraft value) to avoid problems in creative mode
 	_mcl_hardness = -1,
diff --git a/mods/ITEMS/mcl_fire/init.lua b/mods/ITEMS/mcl_fire/init.lua
index c90d0725..f92e2d69 100644
--- a/mods/ITEMS/mcl_fire/init.lua
+++ b/mods/ITEMS/mcl_fire/init.lua
@@ -35,7 +35,7 @@ minetest.register_node("mcl_fire:fire", {
 	buildable_to = true,
 	sunlight_propagates = true,
 	damage_per_second = 1,
-	groups = {igniter = 1, fire = 1, dig_immediate = 3, not_in_creative_inventory = 1, dig_by_piston=1},
+	groups = {fire = 1, dig_immediate = 3, not_in_creative_inventory = 1, dig_by_piston=1},
 	on_timer = function(pos)
 		local airs = minetest.find_nodes_in_area({x=pos.x-1, y=pos.y-1, z=pos.z-1}, {x=pos.x+1, y=pos.y+4, z=pos.z+1}, {"air"})
 		if #airs == 0 then
@@ -95,7 +95,7 @@ minetest.register_node("mcl_fire:eternal_fire", {
 	buildable_to = true,
 	sunlight_propagates = true,
 	damage_per_second = 1,
-	groups = {igniter = 1, fire = 1, dig_immediate = 3, not_in_creative_inventory = 1, dig_by_piston = 1},
+	groups = {fire = 1, dig_immediate = 3, not_in_creative_inventory = 1, dig_by_piston = 1},
 	on_timer = function(pos)
 		local airs = minetest.find_nodes_in_area({x=pos.x-1, y=pos.y-1, z=pos.z-1}, {x=pos.x+1, y=pos.y+4, z=pos.z+1}, {"air"})
 		while #airs > 0 do
diff --git a/mods/ITEMS/mcl_tnt/init.lua b/mods/ITEMS/mcl_tnt/init.lua
index d607cd25..1f540e3a 100644
--- a/mods/ITEMS/mcl_tnt/init.lua
+++ b/mods/ITEMS/mcl_tnt/init.lua
@@ -48,7 +48,7 @@ minetest.register_node("mcl_tnt:tnt", {
 	is_ground_content = false,
 	stack_max = 64,
 	description = "TNT",
-	_doc_items_longdesc = string.format("An explosive device. When it explodes, it will hurt living beings, destroy blocks around it, throw blocks affected by gravity all over the place and light fires. A single TNT has an explosion radius of %d. With a small chance, blocks may drop as an item (as if being mined) rather than being destroyed. TNT can be ignited by tools, explosions, igniter blocks and redstone signals.", TNT_RANGE),
+	_doc_items_longdesc = string.format("An explosive device. When it explodes, it will hurt living beings, destroy blocks around it, throw blocks affected by gravity all over the place and light fires. A single TNT has an explosion radius of %d. With a small chance, blocks may drop as an item (as if being mined) rather than being destroyed. TNT can be ignited by tools, explosions, fire, lava and redstone signals.", TNT_RANGE),
 	_doc_items_usagehelp = "Place the TNT on the ground and ignite it with one of the methods above. Quickly get in safe distance quickly. The TNT will start to be affected by gravity and explodes in 4 seconds.",
 	groups = { dig_immediate = 3, tnt = 1, },
 	mesecons = {effector = {