I know its reporst but i checked some and there was only advice about zoltun that you are supposed to run.
Here i give a little guide i found out to help you make him extremly easy insted of annoying runing around hoping he wont kill you.
So far our best drops we had were 1240dps crossbow 950dps dagger.
My advice is that you take all MF equipment you can since you are not needed to make any damage (it will go faster if you do but its not needed).
All you do is take quest The Prime evil. Take teleport to The Crystal Colonade,
Now to Gateway to spire. There is Leah she is quite hard only WD but still i suggest to skip her. Get to Silver Spire 1.
There you can find one of 3 encounters: Magda, mira eamon, Zoltun Kulle.
Mira is quite hard and time consuming so i suggest to skip her since she can summon army and tyrael cant deal with it on his own most of the time.
Magda is easy. She can do only frontal attack. For this you just stand behind tyrael. He can kill her in 1minute on his own(hits for 25-40k)
Zoltun Kulle is doable and extremly easy with this trick i show you on screanshots.
here is position you have to make tyrael stand and where you shoud stand.
here is where you stand (if you are ranged you can dps him if you are melle you have to wait before tyrael kills him)
after he drops frost balls under your feet just step a little away from him and it will be fine