From b3881bd1fc859ec672236e6bb31e0b0cec4078b1 Mon Sep 17 00:00:00 2001
From: eppc0330 <47050704+eppc0330@users.noreply.github.com>
Date: Mon, 13 Mar 2023 08:25:47 +0900
Subject: [PATCH] Implement NPC_GRADUAL_GRAVITY (#7635)

---
 db/re/skill_db.yml           | 12 ++++++++++++
 db/re/status.yml             |  8 ++++++++
 src/common/mmo.hpp           |  2 +-
 src/map/script_constants.hpp |  1 +
 src/map/skill.cpp            |  5 +++++
 src/map/status.cpp           | 12 ++++++++++++
 src/map/status.hpp           |  2 ++
 7 files changed, 41 insertions(+), 1 deletion(-)

diff --git a/db/re/skill_db.yml b/db/re/skill_db.yml
index d877897d0f..7b57d015d3 100644
--- a/db/re/skill_db.yml
+++ b/db/re/skill_db.yml
@@ -17907,6 +17907,18 @@ Body:
         NoReiteration: true
         NoOverlap: true
     Status: PropertyWalk
+  - Id: 752
+    Name: NPC_GRADUAL_GRAVITY
+    Description: Increased Gravity
+    MaxLevel: 3
+    TargetType: Attack
+    DamageFlags:
+      NoDamage: true
+    Flags:
+      IsNpc: true
+    Range: 9
+    Duration1: 3000
+    Status: GRADUAL_GRAVITY
   - Id: 756
     Name: NPC_WIDEBLEEDING2
     Description: Wide Bleeding
diff --git a/db/re/status.yml b/db/re/status.yml
index 58b2f4652f..16ccd4797a 100644
--- a/db/re/status.yml
+++ b/db/re/status.yml
@@ -8548,3 +8548,11 @@ Body:
       Debuff: true
     CalcFlags:
       Res: true
+  - Status: GRADUAL_GRAVITY
+    Icon: EFST_GRADUAL_GRAVITY
+    DurationLookup: NPC_GRADUAL_GRAVITY
+    Flags:
+      BlEffect: true
+      DisplayPc: true
+      NoDispell: true
+      NoClearance: true
diff --git a/src/common/mmo.hpp b/src/common/mmo.hpp
index 6f67726e54..804926f5b1 100644
--- a/src/common/mmo.hpp
+++ b/src/common/mmo.hpp
@@ -89,7 +89,7 @@ typedef uint32 t_itemid;
 #endif
 #define MAX_FAME 1000000000 ///Max fame points
 #define MAX_CART 100 ///Maximum item in cart
-#define MAX_SKILL 1481 ///Maximum skill can be hold by Player, Homunculus, & Mercenary (skill list) AND skill_db limit
+#define MAX_SKILL 1486 ///Maximum skill can be hold by Player, Homunculus, & Mercenary (skill list) AND skill_db limit
 #define DEFAULT_WALK_SPEED 150 ///Default walk speed
 #define MIN_WALK_SPEED 20 ///Min walk speed
 #define MAX_WALK_SPEED 1000 ///Max walk speed
diff --git a/src/map/script_constants.hpp b/src/map/script_constants.hpp
index 665d11caa0..5ba824c51d 100644
--- a/src/map/script_constants.hpp
+++ b/src/map/script_constants.hpp
@@ -1872,6 +1872,7 @@
 	export_constant(SC_TOXIN_OF_MANDARA);
 	export_constant(SC_GOLDENE_TONE);
 	export_constant(SC_TEMPERING);
+	export_constant(SC_GRADUAL_GRAVITY);
 
 #ifdef RENEWAL
 	export_constant(SC_EXTREMITYFIST2);
diff --git a/src/map/skill.cpp b/src/map/skill.cpp
index 75e04aa17a..21c72b5e97 100755
--- a/src/map/skill.cpp
+++ b/src/map/skill.cpp
@@ -7817,6 +7817,11 @@ int skill_castend_nodamage_id (struct block_list *src, struct block_list *bl, ui
 			sc_start(src,bl,type,100,skill_lv,skill_get_time(skill_id,skill_lv)));
 		break;
 
+	case NPC_GRADUAL_GRAVITY:
+		status_change_start(src, bl, type, 10000, skill_lv, 0, 0, 0, skill_get_time(skill_id, skill_lv), SCSTART_NOAVOID|SCSTART_NOTICKDEF|SCSTART_NORATEDEF);
+		clif_skill_nodamage(src, bl, skill_id, skill_lv, 1);
+		break;
+
 #ifdef RENEWAL
 	// EDP also give +25% WATK poison pseudo element to user.
 	case ASC_EDP:
diff --git a/src/map/status.cpp b/src/map/status.cpp
index b6ef6f9fdf..02c2bfb025 100644
--- a/src/map/status.cpp
+++ b/src/map/status.cpp
@@ -9352,6 +9352,7 @@ static int status_get_sc_interval(enum sc_type type)
 		case SC_LEECHESEND:
 		case SC_DPOISON:
 		case SC_DEATHHURT:
+		case SC_GRADUAL_GRAVITY:
 			return 1000;
 		case SC_BURNING:
 		case SC_PYREXIA:
@@ -10889,6 +10890,11 @@ int status_change_start(struct block_list* src, struct block_list* bl,enum sc_ty
 				val4 = 1;
 			tick_time = val2 * 1000; // [GodLesZ] tick time
 			break;
+		case SC_GRADUAL_GRAVITY:
+			val2 = 10 * val1;
+			tick_time = status_get_sc_interval(type);
+			val4 = tick - tick_time; // Remaining time
+			break;
 		case SC_BOSSMAPINFO:
 			if( sd != NULL ) {
 				struct mob_data *boss_md = map_getmob_boss(bl->m); // Search for Boss on this Map
@@ -13960,6 +13966,12 @@ TIMER_FUNC(status_change_timer){
 			return 0;
 		}
 		break;
+		
+	case SC_GRADUAL_GRAVITY:
+		if (sce->val4 >= 0) {
+			status_zap(bl, status->max_hp * sce->val2 / 100, 0);
+		}
+		break;
 
 	case SC_BOSSMAPINFO:
 		if( sd && --(sce->val4) >= 0 ) {
diff --git a/src/map/status.hpp b/src/map/status.hpp
index f932e87f44..899f3b2591 100644
--- a/src/map/status.hpp
+++ b/src/map/status.hpp
@@ -1263,6 +1263,8 @@ enum sc_type : int16 {
 	SC_GOLDENE_TONE,
 	SC_TEMPERING,
 
+	SC_GRADUAL_GRAVITY,
+
 #ifdef RENEWAL
 	SC_EXTREMITYFIST2, //! NOTE: This SC should be right before SC_MAX, so it doesn't disturb if RENEWAL is disabled
 #endif