Index: scripts/globals/magic.lua
===================================================================
--- scripts/globals/magic.lua	(revision 3801)
+++ scripts/globals/magic.lua	(working copy)
@@ -866,12 +866,8 @@
 	--get the resisted damage
 	dmg = dmg*resist;
 	if(skill == NINJUTSU_SKILL) then
-		-- boost ninjitsu damage
-		-- 5% ninjitsu damage
-		local head = caster:getEquipID(SLOT_HEAD);
-		if(head == 15084) then
-			dmg = math.floor(dmg * 1.05);
-		end
+		-- Ninjutsu Mag Dmg Bonus (Koga Hatsuburi etc.)
+		dmg = math.floor(dmg * (1 + (caster:getMod(MOD_NIN_MAG_DMG)/100)));
 	end
 	--add on bonuses (staff/day/weather/jas/mab/etc all go in this function)
 	dmg = addBonuses(caster,spell,target,dmg);
Index: scripts/globals/status.lua
===================================================================
--- scripts/globals/status.lua	(revision 3801)
+++ scripts/globals/status.lua	(working copy)
@@ -579,6 +579,7 @@
 MOD_MDEF			= 0x1D
 MOD_MACC			= 0x1E
 MOD_MEVA			= 0x1F
+MOD_NIN_MAG_DMG		= 0x1A4
 MOD_FIREATT			= 0x20
 MOD_ICEATT			= 0x21
 MOD_WINDATT			= 0x22
Index: src/map/modifier.h
===================================================================
--- src/map/modifier.h	(revision 3801)
+++ src/map/modifier.h	(working copy)
@@ -69,6 +69,7 @@
 	MOD_MDEF                      =0x1D,// Magic Defense
 	MOD_MACC                      =0x1E,// Magic Accuracy
 	MOD_MEVA                      =0x1F,// Magic Evasion
+	MOD_NIN_MAG_DMG				  =0x1A4,	// Ninjutsu Magic Dmg % Bonus
 
 	// Magic Accuracy and Elemental Attacks
 
@@ -441,7 +442,7 @@
 	MOD_EAT_RAW_MEAT			  = 410
 };
 
-#define MAX_MODIFIER	       411
+#define MAX_MODIFIER	       0x242