Core/Scripts: fix Nightfall proc chance and reduce it for victims with level above 60

Port From (https://github.com/TrinityCore/TrinityCore/commit/5f70be050f971ee70da8953c4f094cb2adc233f8)
2019-08-31 11:12:07 -04:00
parent f7f2930ac8
commit 9ef63a86cf
4 changed files with 46 additions and 1 deletions
@@ -360,4 +360,27 @@ namespace Scripts.World
            return true;
        }
    }
+
+    // Only used currently for
+    [Script]// 19169: Nightfall
+    class item_generic_limit_chance_above_60 : ItemScript
+    {
+        public item_generic_limit_chance_above_60() : base("item_generic_limit_chance_above_60") { }
+
+        public override bool OnCastItemCombatSpell(Player player, Unit victim, SpellInfo spellInfo, Item item)
+        {
+            // spell proc chance gets severely reduced on victims > 60 (formula unknown)
+            if (victim.getLevel() > 60)
+            {
+                // gives ~0.1% proc chance at lvl 70
+                float lvlPenaltyFactor = 9.93f;
+                float failureChance = (victim.GetLevelForTarget(player) - 60) * lvlPenaltyFactor;
+
+                // base ppm chance was already rolled, only roll success chance
+                return !RandomHelper.randChance(failureChance);
+            }
+
+            return true;
+        }
+    }
 }