Implemented NPC_DEADLYCURSE2 and NPC_DEADLYCURSE (#8447)

* Implemented NPC_DEADLYCURSE2
* Splash skill inflicting no damage and activating the status "Deadly_Defeasance" on surrounding target
* Unknown if the duration scale with level. The duration at level 5 is 30s

* Implemented NPC_DEADLYCURSE
* There is not much information on this, assuming it is a single target skill
* Does not deal any damage
* No info on max level, monsters use it level 1
* Duration at level 1 is 15s

* Uncommented NPC_DEADLYCURSE2 in mob_skill_db

db/re/mob_skill_db.txt

@@ -14673,7 +14673,7 @@
 21360,EP18_MD_SCHULANG_L@NPC_TELEKINESISATTACK,attack,191,2,3000,0,5000,yes,target,always,0,,,,,,,
 21360,EP18_MD_SCHULANG_L@NPC_POWERUP,attack,349,3,5000,0,30000,yes,self,always,0,,,,,,,
 21360,EP18_MD_SCHULANG_L@NPC_DARKSTRIKE,chase,340,3,3000,200,15000,yes,target,always,0,,,,,,,
-// 21360,EP18_MD_SCHULANG_L@NPC_DEADLYCURSE2,attack,779,5,5000,1000,30000,no,self,always,0,,,,,,55,
+21360,EP18_MD_SCHULANG_L@NPC_DEADLYCURSE2,attack,779,5,5000,1000,30000,no,self,always,0,,,,,,55,
 21360,EP18_MD_SCHULANG_L@NPC_BLOODDRAIN,attack,199,1,2000,0,10000,yes,target,always,0,,,,,,,
 21360,EP18_MD_SCHULANG_L@NPC_DARKSTRIKE,attack,340,3,3000,200,15000,yes,target,always,0,,,,,,,
 21360,EP18_MD_SCHULANG_L@NPC_WIDESTONE2,attack,759,3,3000,500,30000,no,target,always,0,,,,,,,
@@ -14698,6 +14698,6 @@
 21361,EP18_MD_DEMI_FREYJA_L@NPC_HELLJUDGEMENT2,attack,768,5,1000,500,120000,yes,target,always,0,,,,,,,
 21361,EP18_MD_DEMI_FREYJA_L@NPC_CHANGEDARKNESS,attack,168,1,1000,0,120000,yes,self,always,0,,,,,,,
 21361,EP18_MD_DEMI_FREYJA_L@NPC_CHANGEHOLY,attack,167,1,3000,0,120000,yes,self,always,0,,,,,,,
-// 21361,EP18_MD_DEMI_FREYJA_L@NPC_DEADLYCURSE2,attack,779,5,5000,1000,30000,no,self,always,0,,,,,,55,
+21361,EP18_MD_DEMI_FREYJA_L@NPC_DEADLYCURSE2,attack,779,5,5000,1000,30000,no,self,always,0,,,,,,55,
 21361,EP18_MD_DEMI_FREYJA_L@NPC_CANE_OF_EVIL_EYE,chase,780,3,8000,300,30000,no,target,always,0,,,,,,,
 21361,EP18_MD_DEMI_FREYJA_L@NPC_CANE_OF_EVIL_EYE,attack,780,5,7000,300,30000,yes,target,always,0,,,,,,,

db/re/skill_db.yml

@@ -18362,6 +18362,43 @@ Body:
     HitCount: 1
     Duration1: 60000
     Status: Relieve_off
+  - Id: 776
+    Name: NPC_DEADLYCURSE
+    Description: Deadly Curse
+    MaxLevel: 1
+    TargetType: Attack
+    DamageFlags:
+      NoDamage: true
+    Flags:
+      IgnoreGtb: true
+      IsNpc: true
+    Range: 1
+    Duration1: 15000
+    Status: Deadly_Defeasance
+  - Id: 779
+    Name: NPC_DEADLYCURSE2
+    Description: Deadly Curse 2
+    MaxLevel: 5
+    TargetType: Self
+    DamageFlags:
+      NoDamage: true
+      Splash: true
+    Flags:
+      IgnoreGtb: true
+      IsNpc: true
+    SplashArea:
+      - Level: 1
+        Area: 2
+      - Level: 2
+        Area: 3
+      - Level: 3
+        Area: 4
+      - Level: 4
+        Area: 5
+      - Level: 5
+        Area: 6
+    Duration2: 30000
+    Status: Deadly_Defeasance
   - Id: 780
     Name: NPC_CANE_OF_EVIL_EYE
     Description: Cane of evil eye

src/map/skill.cpp

@@ -8018,6 +8018,7 @@ int skill_castend_nodamage_id (struct block_list *src, struct block_list *bl, ui
 		break;
 
 	case NPC_GRADUAL_GRAVITY:
+	case NPC_DEADLYCURSE:
 		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;
@@ -10758,6 +10759,7 @@ int skill_castend_nodamage_id (struct block_list *src, struct block_list *bl, ui
 	case NPC_WIDE_DEEP_SLEEP:
 	case NPC_WIDESIREN:
 	case NPC_WIDEWEB:
+	case NPC_DEADLYCURSE2:
 		if (flag&1){
 			switch ( type ) {
 			case SC_BURNING: