It was just confirmed, there will be a class tree for sentinel in which if you hold down the super button activators, you will cast a ward of dawn like in D1. I don t have a link to the original source, but here s how i learned https://youtu.be/FyHgyQpbw6Q
Needs "Gift of the Void" to be a contender. Only gens a couple orbs. Super chaining is vital.