src/custom/script.inc     | 115 ++++++++++++++++++++++++++++++++++++++++++++++
 src/custom/script_def.inc |   3 ++
 src/map/script.c          |  57 +++++++++++++++++++++++
 src/map/script.h          |  32 +++++++++++++
 4 files changed, 207 insertions(+)

diff --git a/src/custom/script.inc b/src/custom/script.inc
index 1e01c88..84a11e6 100644
--- a/src/custom/script.inc
+++ b/src/custom/script.inc
@@ -17,3 +17,118 @@
 //	script_pushint(st,1);
 //	return 0;
 //}
+
+/*==========================================
+ * Modify the value of GID monster
+ * setmobdata <GID>, <parameter>, <new value>;
+ *------------------------------------------*/
+BUILDIN_FUNC(setmobdata) {
+	int mob_gid = script_getnum(st,2),
+		parameter = script_getnum(st,3),
+		value = script_getnum(st,4);
+	struct block_list *bl = map_id2bl( mob_gid );
+	if ( bl == NULL ) {
+		ShowError( "buildin_setmobdata: Attempted to modify a non-existed GID %d.\n", mob_gid );
+		return SCRIPT_CMD_FAILURE;
+	}
+	if ( bl->type != BL_MOB ) {
+		ShowError( "buildin_setmobdata: Attempted to modify not a monster. GID %d.\n", mob_gid );
+		return SCRIPT_CMD_FAILURE;
+	}
+	{
+		TBL_MOB *md = (TBL_MOB*)bl;
+		switch( parameter ) {
+		case MOBDATA_MOBID:
+			ShowWarning( "buildin_setmobdata: Attempted to change MobID with type MOBDATA_MOBID.\n" );
+			break;
+		case MOBDATA_LEVEL: md->level = cap_value(value, 1, SINT16_MAX); break;
+		case MOBDATA_HP: md->status.hp = cap_value(value, 1, SINT32_MAX); break;
+		case MOBDATA_MAXHP: md->status.max_hp = cap_value(value, 1, SINT32_MAX); break;
+		case MOBDATA_ATK_MIN: md->status.rhw.atk = cap_value(value, 1, md->status.rhw.atk2); break;
+		case MOBDATA_ATK_MAX: md->status.rhw.atk2 = cap_value(value, md->status.rhw.atk, SINT16_MAX); break;
+		case MOBDATA_MATK_MIN: md->status.matk_min = cap_value(value, 1, md->status.matk_max); break;
+		case MOBDATA_MATK_MAX: md->status.matk_max = cap_value(value, md->status.matk_min, SINT16_MAX); break;
+		case MOBDATA_DEF: md->status.def = cap_value(value, 0, SINT16_MAX); break;
+		case MOBDATA_MDEF: md->status.mdef = cap_value(value, 0, SINT16_MAX); break;
+		case MOBDATA_HIT: md->status.hit = cap_value(value, 0, SINT16_MAX); break;
+		case MOBDATA_FLEE: md->status.flee = cap_value(value, 0, SINT16_MAX); break;
+		case MOBDATA_CRITICAL: md->status.cri = cap_value(value, 0, SINT16_MAX); break;
+		case MOBDATA_PERFECT_DODGE: md->status.flee2 = cap_value(value, 0, SINT16_MAX); break;
+		case MOBDATA_STR: md->status.str = cap_value(value, 1, SINT16_MAX); break;
+		case MOBDATA_AGI: md->status.agi = cap_value(value, 1, SINT16_MAX); break;
+		case MOBDATA_VIT: md->status.vit = cap_value(value, 1, SINT16_MAX); break;
+		case MOBDATA_INT: md->status.int_ = cap_value(value, 1, SINT16_MAX); break;
+		case MOBDATA_DEX: md->status.dex = cap_value(value, 1, SINT16_MAX); break;
+		case MOBDATA_LUK: md->status.luk = cap_value(value, 1, SINT16_MAX); break;
+		case MOBDATA_ATTACK_RANGE: md->status.rhw.range = cap_value(value, 1, battle_config.area_size); break;
+		case MOBDATA_RACE: md->status.race = cap_value(value, 1, RC_MAX - 1); break;
+		case MOBDATA_ELEMENT_TYPE: md->status.def_ele = cap_value(value, 1, ELE_MAX-1); break;
+		case MOBDATA_ELEMENT_LEVEL: md->status.ele_lv = cap_value(value, 1, 4); break;
+		case MOBDATA_MODE: md->status.mode = cap_value(value, 1, SINT32_MAX); break;
+		case MOBDATA_MOVESPEED: md->status.speed = cap_value(value, MIN_WALK_SPEED, MAX_WALK_SPEED); break;
+		case MOBDATA_ATTACK_DELAY: md->status.adelay = cap_value(value, 1, SINT16_MAX); break;
+		case MOBDATA_ATTACK_MOTION: md->status.amotion = cap_value(value, 1, md->status.adelay); break;
+		case MOBDATA_DAMAGE_MOTION: md->status.dmotion = cap_value(value, 1, SINT16_MAX); break;
+		default:
+			ShowError( "buildin_setmobdata: Attempted to use non-existing parameter %d.\n", parameter );
+			return SCRIPT_CMD_FAILURE;
+		}
+	}
+	return SCRIPT_CMD_SUCCESS;
+}
+
+/*==========================================
+ * Retrieve the value of GID monster
+ * getmobdata <GID>, <parameter>;
+ *------------------------------------------*/
+BUILDIN_FUNC(getmobdata) {
+	int mob_gid = script_getnum(st,2),
+		parameter = script_getnum(st,3);
+	struct block_list *bl = map_id2bl( mob_gid );
+	if ( bl == NULL ) {
+		ShowError( "buildin_getmobdata: Attempted to retrieve a non-existed GID %d.\n", mob_gid );
+		return SCRIPT_CMD_FAILURE;
+	}
+	if ( bl->type != BL_MOB ) {
+		ShowError( "buildin_getmobdata: Attempted to retrieve not a monster. GID %d.\n", mob_gid );
+		return SCRIPT_CMD_FAILURE;
+	}
+	{
+		TBL_MOB *md = (TBL_MOB*)bl;
+		switch( parameter ) {
+			case MOBDATA_MOBID: script_pushint( st, md->mob_id ); break;
+			case MOBDATA_LEVEL: script_pushint( st, md->level ); break;
+			case MOBDATA_HP: script_pushint( st, md->status.hp ); break;
+			case MOBDATA_MAXHP: script_pushint( st, md->status.max_hp ); break;
+			case MOBDATA_ATK_MIN: script_pushint( st, md->status.rhw.atk ); break;
+			case MOBDATA_ATK_MAX: script_pushint( st, md->status.rhw.atk2 ); break;
+			case MOBDATA_MATK_MIN: script_pushint( st, md->status.matk_min ); break;
+			case MOBDATA_MATK_MAX: script_pushint( st, md->status.matk_max ); break;
+			case MOBDATA_DEF: script_pushint( st, md->status.def ); break;
+			case MOBDATA_MDEF: script_pushint( st, md->status.mdef ); break;
+			case MOBDATA_HIT: script_pushint( st, md->status.hit ); break;
+			case MOBDATA_FLEE: script_pushint( st, md->status.flee ); break;
+			case MOBDATA_CRITICAL: script_pushint( st, md->status.cri ); break;
+			case MOBDATA_PERFECT_DODGE: script_pushint( st, md->status.flee2 ); break;
+			case MOBDATA_STR: script_pushint( st, md->status.str ); break;
+			case MOBDATA_AGI: script_pushint( st, md->status.agi ); break;
+			case MOBDATA_VIT: script_pushint( st, md->status.vit ); break;
+			case MOBDATA_INT: script_pushint( st, md->status.int_ ); break;
+			case MOBDATA_DEX: script_pushint( st, md->status.dex ); break;
+			case MOBDATA_LUK: script_pushint( st, md->status.luk ); break;
+			case MOBDATA_ATTACK_RANGE: script_pushint( st, md->status.rhw.range ); break;
+			case MOBDATA_RACE: script_pushint( st, md->status.race ); break;
+			case MOBDATA_ELEMENT_TYPE: script_pushint( st, md->status.def_ele ); break;
+			case MOBDATA_ELEMENT_LEVEL: script_pushint( st, md->status.ele_lv ); break;
+			case MOBDATA_MODE: script_pushint( st, md->status.mode ); break;
+			case MOBDATA_MOVESPEED: script_pushint( st, md->status.speed ); break;
+			case MOBDATA_ATTACK_DELAY: script_pushint( st, md->status.adelay ); break;
+			case MOBDATA_ATTACK_MOTION: script_pushint( st, md->status.amotion ); break;
+			case MOBDATA_DAMAGE_MOTION: script_pushint( st, md->status.dmotion ); break;
+			default :
+				ShowError( "buildin_getmobdata: Attempted to use non-existing parameter %d.\n", parameter );
+				return SCRIPT_CMD_FAILURE;
+		}
+	}
+	return SCRIPT_CMD_SUCCESS;
+}
\ No newline at end of file
diff --git a/src/custom/script_def.inc b/src/custom/script_def.inc
index 3319eea..161ce8b 100644
--- a/src/custom/script_def.inc
+++ b/src/custom/script_def.inc
@@ -9,3 +9,6 @@
  **/
 
 //BUILDIN_DEF(example,""),
+
+	BUILDIN_DEF(setmobdata,"iii"),
+	BUILDIN_DEF(getmobdata,"ii"),
\ No newline at end of file
diff --git a/src/map/script.c b/src/map/script.c
index 326f3c0..797bb27 100644
--- a/src/map/script.c
+++ b/src/map/script.c
@@ -2291,6 +2291,63 @@ void script_hardcoded_constants(void) {
 	script_set_constant("SCSTART_LOADED",SCSTART_LOADED,false);
 	script_set_constant("SCSTART_NORATEDEF",SCSTART_NORATEDEF,false);
 	script_set_constant("SCSTART_NOICON",SCSTART_NOICON,false);
+
+	/* setmobdata */
+	script_set_constant("MOBDATA_MOBID",MOBDATA_MOBID,false);
+	script_set_constant("MOBDATA_LEVEL",MOBDATA_LEVEL,false);
+	script_set_constant("MOBDATA_HP",MOBDATA_HP,false);
+	script_set_constant("MOBDATA_MAXHP",MOBDATA_MAXHP,false);
+	script_set_constant("MOBDATA_ATK_MIN",MOBDATA_ATK_MIN,false);
+	script_set_constant("MOBDATA_ATK_MAX",MOBDATA_ATK_MAX,false);
+	script_set_constant("MOBDATA_MATK_MIN",MOBDATA_MATK_MIN,false);
+	script_set_constant("MOBDATA_MATK_MAX",MOBDATA_MATK_MAX,false);
+	script_set_constant("MOBDATA_DEF",MOBDATA_DEF,false);
+	script_set_constant("MOBDATA_MDEF",MOBDATA_MDEF,false);
+	script_set_constant("MOBDATA_HIT",MOBDATA_HIT,false);
+	script_set_constant("MOBDATA_FLEE",MOBDATA_FLEE,false);
+	script_set_constant("MOBDATA_CRITICAL",MOBDATA_CRITICAL,false);
+	script_set_constant("MOBDATA_PERFECT_DODGE",MOBDATA_PERFECT_DODGE,false);
+	script_set_constant("MOBDATA_STR",MOBDATA_STR,false);
+	script_set_constant("MOBDATA_AGI",MOBDATA_AGI,false);
+	script_set_constant("MOBDATA_VIT",MOBDATA_VIT,false);
+	script_set_constant("MOBDATA_INT",MOBDATA_INT,false);
+	script_set_constant("MOBDATA_DEX",MOBDATA_DEX,false);
+	script_set_constant("MOBDATA_LUK",MOBDATA_LUK,false);
+	script_set_constant("MOBDATA_ATTACK_RANGE",MOBDATA_ATTACK_RANGE,false);
+	script_set_constant("MOBDATA_RACE",MOBDATA_RACE,false);
+	script_set_constant("MOBDATA_ELEMENT_TYPE",MOBDATA_ELEMENT_TYPE,false);
+	script_set_constant("MOBDATA_ELEMENT_LEVEL",MOBDATA_ELEMENT_LEVEL,false);
+	script_set_constant("MOBDATA_MODE",MOBDATA_MODE,false);
+	script_set_constant("MOBDATA_MOVESPEED",MOBDATA_MOVESPEED,false);
+	script_set_constant("MOBDATA_ATTACK_DELAY",MOBDATA_ATTACK_DELAY,false);
+	script_set_constant("MOBDATA_ATTACK_MOTION",MOBDATA_ATTACK_MOTION,false);
+	script_set_constant("MOBDATA_DAMAGE_MOTION",MOBDATA_DAMAGE_MOTION,false);
+
+	/* e_mode */
+	script_set_constant("MD_CANMOVE",MD_CANMOVE,false);
+	script_set_constant("MD_LOOTER",MD_LOOTER,false);
+	script_set_constant("MD_AGGRESSIVE",MD_AGGRESSIVE,false);
+	script_set_constant("MD_ASSIST",MD_ASSIST,false);
+	script_set_constant("MD_CASTSENSOR_IDLE",MD_CASTSENSOR_IDLE,false);
+	script_set_constant("MD_BOSS",MD_BOSS,false);
+	script_set_constant("MD_PLANT",MD_PLANT,false);
+	script_set_constant("MD_CANATTACK",MD_CANATTACK,false);
+	script_set_constant("MD_DETECTOR",MD_DETECTOR,false);
+	script_set_constant("MD_CASTSENSOR_CHASE",MD_CASTSENSOR_CHASE,false);
+	script_set_constant("MD_CHANGECHASE",MD_CHANGECHASE,false);
+	script_set_constant("MD_ANGRY",MD_ANGRY,false);
+	script_set_constant("MD_CHANGETARGET_MELEE",MD_CHANGETARGET_MELEE,false);
+	script_set_constant("MD_CHANGETARGET_CHASE",MD_CHANGETARGET_CHASE,false);
+	script_set_constant("MD_TARGETWEAK",MD_TARGETWEAK,false);
+	script_set_constant("MD_RANDOMTARGET",MD_RANDOMTARGET,false);
+	script_set_constant("MD_IGNOREMELEE",MD_IGNOREMELEE,false);
+	script_set_constant("MD_IGNOREMAGIC",MD_IGNOREMAGIC,false);
+	script_set_constant("MD_IGNORERANGED",MD_IGNORERANGED,false);
+	script_set_constant("MD_MVP",MD_MVP,false);
+	script_set_constant("MD_IGNOREMISC",MD_IGNOREMISC,false);
+	script_set_constant("MD_KNOCKBACK_IMMUNE",MD_KNOCKBACK_IMMUNE,false);
+	script_set_constant("MD_NORANDOM_WALK",MD_NORANDOM_WALK,false);
+	script_set_constant("MD_NOCAST_SKILL",MD_NOCAST_SKILL,false);
 }
 
 /*==========================================
diff --git a/src/map/script.h b/src/map/script.h
index 87dc604..abe1a06 100644
--- a/src/map/script.h
+++ b/src/map/script.h
@@ -297,6 +297,38 @@ enum script_parse_options {
 	SCRIPT_RETURN_EMPTY_SCRIPT = 0x4// returns the script object instead of NULL for empty scripts
 };
 
+enum mobdata_type {
+	MOBDATA_MOBID = 1,
+	MOBDATA_LEVEL,
+	MOBDATA_HP,
+	MOBDATA_MAXHP,
+	MOBDATA_ATK_MIN,
+	MOBDATA_ATK_MAX,
+	MOBDATA_MATK_MIN,
+	MOBDATA_MATK_MAX,
+	MOBDATA_DEF,
+	MOBDATA_MDEF,
+	MOBDATA_HIT,
+	MOBDATA_FLEE,
+	MOBDATA_CRITICAL,
+	MOBDATA_PERFECT_DODGE,
+	MOBDATA_STR,
+	MOBDATA_AGI,
+	MOBDATA_VIT,
+	MOBDATA_INT,
+	MOBDATA_DEX,
+	MOBDATA_LUK,
+	MOBDATA_ATTACK_RANGE,
+	MOBDATA_RACE,
+	MOBDATA_ELEMENT_TYPE,
+	MOBDATA_ELEMENT_LEVEL,
+	MOBDATA_MODE,
+	MOBDATA_MOVESPEED,
+	MOBDATA_ATTACK_DELAY,
+	MOBDATA_ATTACK_MOTION,
+	MOBDATA_DAMAGE_MOTION,
+};
+
 /**
  * used to generate quick script_array entries
  **/