Fix var names.

baddies.lua

--- Enable fireballs/explosions
-dmobs.destructive = true 
-
 -- Fox
-if destructive then
+if dmobs.destructive then
 mobs:register_mob("dmobs:pig_evil", {
 	type = "monster",
 	passive = true,
@@ -232,7 +229,7 @@ mobs:register_mob("dmobs:orc_redesign", {
 	},
 })
 
-if not dragons == true then
+if not dmobs.dragons == true then
 mobs:register_spawn("dmobs:orc", {"default:snow","default:snow_block", "default:desert_sand"}, 20, 10, 15000, 2, 31000)
 else
 mobs:register_spawn("dmobs:orc", {"default:snow","default:snow_block", "default:desert_sand"}, 20, 10, 350, 2, 31000)
@@ -289,7 +286,7 @@ mobs:register_mob("dmobs:ogre", {
 	},
 })
 
-if not dragons == true then
+if not dmobs.dragons == true then
 mobs:register_spawn("dmobs:ogre", {"default:snow","default:dirt_with_dry_grass", "default:desert_sand"}, 20, 10, 15000, 2, 31000)
 else
 mobs:register_spawn("dmobs:ogre", {"default:snow","default:dirt_with_dry_grass", "default:desert_sand"}, 20, 10, 350, 2, 31000)
@@ -367,7 +364,7 @@ else
 	})
 
 	--Thanks to Tenplus1
-	if destructive == true then
+	if dmobs.destructive == true then
 	mobs:register_arrow("dmobs:fire", {
 	   visual = "sprite",
 	   visual_size = {x = 0.5, y = 0.5},

dragons.lua

-dmobs = {}
-
 --thanks to diriel, blert2112 and taikedz 
 
 local step_custom = function(self, dtime)
@@ -14,9 +12,9 @@ local tamed_dragons = {}
 
 local node_hit = {}
 
-local destructive = true
+dmobs.destructive = true
 
-if destructive == true then
+if dmobs.destructive == true then
 node_hit = function(self, pos, node)
 mobs:explosion(pos, 2, 1, 1)
 end

init.lua

@@ -6,15 +6,18 @@ dmobs = {}
 
 dofile(minetest.get_modpath("dmobs").."/api.lua")
 
+-- Enable dragons (disable to remove tamed dragons and dragon bosses)
+dmobs.dragons = true
+
+-- Enable fireballs/explosions
+dmobs.destructive = true
+
 --peaceful mobs setting
 
 if not minetest.setting_getbool("only_peaceful_mobs") then
 	dofile(minetest.get_modpath("dmobs").."/baddies.lua")
 end
 
--- Enable dragons (disable to remove tamed dragons and dragon bosses)
-dmobs.dragons = true
-
 --friendly mobs
 
 mobs:register_mob("dmobs:panda", {