Light Barrier

What do you seek?

I am here to find the crystal to make the Light Barrier. I hear I can get them around here.

The Light Barrier... Not many people know of this. You can get the crystals at the Cursed Temple.

The Cursed Temple?

That's correct. Talk to the Insignificant Being in front of the temple for more.

I'd imagine The Rememberer would know about the crystal.