Instant effects that were added by a permanent ability are applied every frame

Via http://forum.openmw.org/viewtopic.php?f=2&t=3212&p=36120#p36121

apps/openmw/mwmechanics/actors.cpp

@@ -486,11 +486,14 @@ namespace MWMechanics
 
         bool wasDead = creatureStats.isDead();
 
-        // tickable effects (i.e. effects having a lasting impact after expiry)
-        // these effects can be applied as "instant" (handled in spellcasting.cpp) or with a duration, handled here
         for (MagicEffects::Collection::const_iterator it = effects.begin(); it != effects.end(); ++it)
         {
+            // tickable effects (i.e. effects having a lasting impact after expiry)
             effectTick(creatureStats, ptr, it->first, it->second.getMagnitude() * duration);
+
+            // instant effects are already applied on spell impact in spellcasting.cpp, but may also come from permanent abilities
+            CastSpell cast(ptr, ptr);
+            cast.applyInstantEffect(ptr, ptr, it->first, it->second.getMagnitude());
         }
 
         // attributes