An example of Effect Stacking would be of Shadow Form's 5 Damage reduction. You cast Shadow Form, then Shroud of Distress, receiving the 5 Damage reduction from SF itself and another 5 from Shroud. If you were to cast another Shroud of Distress while you still have duration from the previous one, it will count as another enchant for reduction (5 first SF, 5 First Shroud, 5 Second Shroud), resulting in 15 damage reduction.
Once the first Shroud runs out, you will then only receive 10 damage reduction.
- A prime example would be of Solo DoA: https://youtu.be/1yjoW-zknTc?t=3918
The build utilizes Assassin enchants that have a long duration and short recharge time. You are able to stack all of these enchants for Shadow Form, allowing you to reduce the Veil effect.