Fall of the High Heavens Diablo III Guide
Last update: 11 May 2016
Talk to Tyrael at the Diamond Gates
This act begins at the Diamond Gates and you'll be exploring High Heavens from now on. You won't find any cities here, however town portal spells and waypoints can transport you back to the Bastion's Keep Stronghold, allowing you to meet with merchants, blacksmiths, jewelers and followers. Head forward to find a new waypoint. Listen to a conversation between Tyrael and Imperius and then speak with Tyrael.
Enter the Vestibule of Light
Notice that there's a portal here which can transport you to the Vestibule of Light. Use it.
Kill Iskatu and his minions
You'll soon have to have to defeat the first demon Diablo sent after you. Start off by attacking Iskatu's minions - Shadow Vermin. To be honest they're the biggest problem during this battle.
Iskatu doesn't have a lot of health points and his attack don't inflict a lot of damage, so the only problem is to make your way to the boss by eliminating all the Shadow Vermin standing in your way. Once you've defeated Iskatu you'll end the first quest of this act.