Larian Studios Forums Divinity - Original Sin Divinity - Original Sin - Enhanced Edition Source temple - how do I get inside the outer door

To get the air switch you need a character with 5 points in telekinesis. If you stand in front of the gate (with the air switch visible a little way further), you'll see there's a gate key beyond the gate to your left. Grab it with telekinesis. It'll open the gate and you can walk to the switch.