a sorry lightning rune this is why I said, lightning swords wrong choice of words I guess. Problem with istvan is healing but not in the grift vs elites or trash but the boss. Some GRs hit very hard and that is when you can feel the lower healing when compared with the healing rune from ww.
A Strange thing that I have never seen once players saying that Battle Rage Bloodshed is actually Unusable. Yes is very powerfull but what good does it do when you meet the craziest density and you can't actually use it because it creates so much lag that even pausing game every 0.5 seconds doesn't work anymore. On Eu players started on softcore (using bulkatos) to swap Bloodsheed with Into the fray because of the lag.
Taking this into consideration id say that Istvan lightning build is above Bulkatos or Istvan physical build, but who know maybe some players don't have this insane lag.