diff --git a/init.lua b/init.lua
index 42ac1f8..713a367 100644
--- a/init.lua
+++ b/init.lua
@@ -6,13 +6,14 @@ spacecannon = {
 
 		-- charge value in EU
 		powerrequirement = 2500
-
-	}
+	},
+	node_resilience = {}
 }
 
 local MP = minetest.get_modpath("spacecannon")
 
 dofile(MP.."/util.lua")
 dofile(MP.."/cannon.lua")
+dofile(MP.."/node_resilience.lua")
 
 print("[OK] Spacecannon")
\ No newline at end of file
diff --git a/node_resilience.lua b/node_resilience.lua
new file mode 100644
index 0000000..14c9f28
--- /dev/null
+++ b/node_resilience.lua
@@ -0,0 +1,8 @@
+
+-- default = 1
+-- >1 = stronger
+-- <1 = weaker
+
+
+spacecannon.node_resilience["default:obsidian"] = 3
+spacecannon.node_resilience["default:obsidian_glass"] = 3
\ No newline at end of file
diff --git a/util.lua b/util.lua
index 7d5ecf2..fde32e9 100644
--- a/util.lua
+++ b/util.lua
@@ -77,12 +77,15 @@ spacecannon.destroy = function(pos, range, intensity)
 
 						else
 							-- default behavior
-							minetest.set_node(np, {name="air"})
-							local itemstacks = minetest.get_node_drops(n.name)
-							for _, itemname in ipairs(itemstacks) do
-								if math.random(5) == 5 then
-									-- chance drop
-									minetest.add_item(np, itemname)
+							local resilience = spacecannon.node_resilience[n.name] or 1
+							if resilience <= 1 or math.random(resilience) == resilience then
+								minetest.set_node(np, {name="air"})
+								local itemstacks = minetest.get_node_drops(n.name)
+								for _, itemname in ipairs(itemstacks) do
+									if math.random(5) == 5 then
+										-- chance drop
+										minetest.add_item(np, itemname)
+									end
 								end
 							end
 						end