Allow hot cobble to be quenched.

abms.lua

@@ -262,6 +262,23 @@ end)
 -- destruction
 ------------------------------------------------------------
 
+local function cool_cobble(pos, node)
+	minetest.set_node(pos, {name = "default:cobble"})
+	minetest.sound_play("default_cool_lava",
+		{pos = pos, max_hear_distance = 16, gain = 0.25})
+end
+
+minetest.register_abm({
+	nodenames = {"fun_caves:hot_cobble",},
+	neighbors = {"group:water"},
+	interval = 1,
+	chance = 1,
+	catch_up = false,
+	action = function(...)
+		cool_cobble(...)
+	end,
+})
+
 -- Exploding fungal fruit
 minetest.register_abm({
 	nodenames = {"fun_caves:fungal_tree_fruit"},