Thanks @T72on1 and @Brak Some quick progress through Act 4, despite some crashes in the first two areas. Lots of Flesh Spawners about so I was making heavy use of CoS to keep them quiet. After the 3rd crash I remembered something about Spawners triggering the CoS bug. I couldn't find anything online to confirm but I stopped using CoS in areas with Spawners and no more crashes. After that they were painful though. If there was only one or two I could keep them quiet with Mind Blast, but otherwise I let them spawn a few babies then dropped a pile of Death Sentries to take care of them all. Izual wasnt a big deal once we'd isolated him from the rest of the monsters. Not really too many dramas anywhere, that 1200+ red bulb is plenty good for NM and Assassins have super crowd control. River of Flame I made some nice use of DS to clear up the Maggot Young, this bit of gold was a bonus amongst all the blood and gore (a bonus, but a useless bonus). The Hellforge saw Razan die just after this shot was taken, but the drop was very lovely. Ko is such a useful rune! There were plenty of deaths for Razan in the Chaos Sanctuary but eventually we made our way to the final seal. After a quick bite to eat it was time for the Big D on p8 ... I was pretty sure I'd end up regretting the decision not to drop the players setting and was prepared for a long, long session. Things didn't start well, with Razan dying almost instantly and me forgetting that with Razan now wielding the Woestave Jacinta would need blue pots if she wanted to cast traps, and also need red pots to restore her life. And there was me wondering why she only had half her life left and couldn't cast spells. BTW, Razan was wearing the Rockstopper and Rockfleece and wielding the Woestave - what for now is our standard boss set-up. A bit of shopping for the right pots and then it was back for a second try. This time Razan got himself in under the lightning hose and things were going pretty well. Jacinta could stand to the side and cast CBS whilst feeding pots to Razan. Once I got a bit of a system going Jacinta also started lobbing Fire Blasts when nothing else was needing doing. Diablo could still hurt Razan, particularly with the Firestorm attack, however the slow from Woestave seemed to keep him pretty quiet. We still managed 6 deaths for Razan over the course of the battle and coming back and setting up a stable battle each time was always a bit nerve-wracking. Here and here are a couple of different positions we ended up in. All very similar and quite safe. 20 minutes later victory was ours and Diablo was vanquished. Not bad for p8 and no crushing blow! Despite remembering to switch back in all Razan's MF gear (finally getting it right) there was nothing exciting in the drop. Level 67 and on to Harrogath and ever closer to Hell!