SpellScript

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-    SPELL_PRIEST_VAMPIRIC_TOUCH_DISPEL              = 64085
+    SPELL_PRIEST_VAMPIRIC_TOUCH_DISPEL              = 64085,
+   SPELL_PRIEST_SHADOW_AFFINITY_REGEN              = 64103,

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        AuraScript* GetAuraScript() const override
        {
            return new spell_pri_vampiric_touch_AuraScript();
        }
};

+// Shadow Affinity : Triggered Spell Ids
+class spell_pri_shadow_affinity : public SpellScriptLoader
+{
+    public:
+        spell_pri_shadow_affinity() : SpellScriptLoader("spell_pri_shadow_affinity") { }
+
+        class spell_pri_shadow_affinity_AuraScript : public AuraScript
+        {
+            PrepareAuraScript(spell_pri_shadow_affinity_AuraScript);
+
+           void HandleDispel(DispelInfo* dispelInfo)
+            {
+                if (Unit* caster = GetCaster())
+               {
+                    if (caster->HasAura(15320)) // Rank 3 Shadow Affinity Talent
+                    {
+                       int32 baseregen = (caster->GetCreateMana() * 15) / 100; // 15%
+                        caster->CastCustomSpell(caster, SPELL_PRIEST_SHADOW_AFFINITY_REGEN, &baseregen, NULL, NULL, true, NULL, NULL);
+                    }
+                    if (caster->HasAura(15318)) // Rank 2 Shadow Affinity Talent
+                    {
+                       int32 baseregen = (caster->GetCreateMana() * 10) / 100; // 10 %
+                        caster->CastCustomSpell(caster, SPELL_PRIEST_SHADOW_AFFINITY_REGEN, &baseregen, NULL, NULL, true, NULL, NULL);
+                    }
+                   if (caster->HasAura(15272)) // Rank 1 Shadow Affinity Talent
+                    {
+                       int32 baseregen = (caster->GetCreateMana() * 5) / 100; // 5%
+                       caster->CastCustomSpell(caster, SPELL_PRIEST_SHADOW_AFFINITY_REGEN, &baseregen, NULL, NULL, true, NULL, NULL);
+                    }
+               }
+            }
+
+            void Register()
+            {
+                AfterDispel += AuraDispelFn(spell_pri_shadow_affinity_AuraScript::HandleDispel);
+            }
+       };
+
+        AuraScript* GetAuraScript() const
+        {
+            return new spell_pri_shadow_affinity_AuraScript();
+        }
+};
+

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    new spell_pri_shadow_word_death();
    new spell_pri_vampiric_touch();
+   new spell_pri_shadow_affinity();
}

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