I died after firing the ballista before getting back to the portal. How do I get back in the Temple? I can get back to Thorgel in the Death altar via Abyss, .but I can't get back through the light door because the crystal is on the other door. Can't get in the front door of the temple because a force pushes me away.

If you talk to Arianwyn in Lletya he will give you the crystal required to enter the Light Temple from the front door (if you no longer have it on you or in your bank). Once you enter the temple you can then fix the light puzzle so you can get through again.

Arianwyn is still in the temple near the Death Altar runis, but I can get to her from the Death Altar portal via the Wildy. I got the crystal. I will try the front dorr again. Thanks.