diff --git a/mods/ITEMS/mcl_core/nodes.lua b/mods/ITEMS/mcl_core/nodes.lua
index a709b53b1d..ba819e0e3e 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 c90d07258d..f92e2d698f 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 d607cd250d..1f540e3a83 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 = {