From dfff9d62e4f0e4112d4ff743a70e4733e27fee3f Mon Sep 17 00:00:00 2001
From: ariel- <ariel-@users.noreply.github.com>
Date: Fri, 16 Mar 2018 12:34:42 -0300
Subject: [PATCH] Core/Spells: autogenerate miss proc for spells with auras
 with hit chance -100

Closes #21629
---
 src/server/game/Spells/SpellMgr.cpp | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/server/game/Spells/SpellMgr.cpp b/src/server/game/Spells/SpellMgr.cpp
index 83d551af76b..78cc1eb7ded 100644
--- a/src/server/game/Spells/SpellMgr.cpp
+++ b/src/server/game/Spells/SpellMgr.cpp
@@ -1908,6 +1908,11 @@ void SpellMgr::LoadSpellProcs()
                 case SPELL_AURA_MOD_BLOCK_PERCENT:
                     procEntry.HitMask = PROC_HIT_BLOCK;
                     break;
+                // proc auras with another aura reducing hit chance (eg 63767) only proc on missed attack
+                case SPELL_AURA_MOD_HIT_CHANCE:
+                    if (spellInfo->Effects[i].CalcValue() <= -100)
+                        procEntry.HitMask = PROC_HIT_MISS;
+                    break;
                 default:
                     continue;
             }