This dark realm needs a hero. The Sword of Light in Elden Ring Shadow of the Erdtree is the legendary Straight Sword that can pierce the darkness. In theory, at least. Here's where to get it and whether or not it's worth your time.
How to Get the SWORD OF LIGHT & DARKNESS? Easy Guide Tutorial Walkthrough (Elden Ring Shadow of Erdtree)
To get your Sword of Light in Elden Ring Shadow of the Erdtree, you need to upgrade the Stone-sheathed Sword at an Altar of Light. There are three ritual altars related to the Stone-sheathed Sword. You get the base weapon by drawing it from one of the altars. Then, the other two randomly transform into crafting tables. You need to find the Sword at an altar and take it to one of the other two to get the Sword of Light or the Sword of Night.
You can tell which altar is which by the color of the pattern on the back. You’ll craft the Sword of Light if it’s a white-yellow glow. A dark glow will make the Sword of Night. A prompt will appear telling you which one you’re about to craft, so don’t worry too much if you click the wrong one. But you only get one Stone-Sheathed Sword. Make it count.
There are three altars to be found in Shadow of the Erdtree. They are located in the following locations.