New Mechanic - Dodge Roll
The Dodge Roll is a new mechanic coming to PoE 2 that wasn't in the original game. As the name suggests, the Dodge Roll allows yoru character to roll in a direction using the space bar (default hotkey).
The Dodge Roll provides a short i-frame (invincibility). When timed well, you can avoid projectiles and attacks. However, large AoE attacks will still hit you. These large AoE attacks from bosses will usually have indicators or tells. This allows you to move or Dodge Roll preemptively before being hit.
Lastly, the Dodge Roll can be used to cancel certain skill animations. If you press a skill with a long channel and find yourself in danger, you can Dodge Roll out of the way instead of committing.
Here's a few final notes on Dodge Roll.
Rolls cannot be cancelled.
Rolling will not be faster than walking.
Rolling is affected by movement speed.