In dungeon for big pull, what I love to do with AST is :
1) Largess, Aspected Benefic + Collective Unconscious + Eye for an Eye + Time Dilatation on tank
2) Arrow double duration or enhanced on me
3) Lucid Dream, Lightspeed
4) Celestial Opposition to stun mobs + add time on every buff from me
5) Spam Gravity

In Shadowbringers, I will feel powerless.