The Godslayer's Greatsword is another in Elden's "Legendary Armaments" as well as a Colossal Greatsword that scales with faith, strength and Dexterity. Although the Elden Ring weapon isn't buried as Elden Ring Runes far similar to the Eclipse Shotel, it does require some skillful platforming and beating a tough Elden Ring boss to get it.
The Elden Godslayer's Greatsword area: going up and down the Divine Tower of Caelid and fighting The Godskin Apostle.The Godslayer's Greatsword can be found in the basement of the Divine Tower of Caelid, located in the north central region of the map close to where it is located near the Dragonbarrow West site of grace. You'll need to climb into the tower, to find an entry point and then back down after entering be prepared to face the "is this where I'm supposed to jump next?" Platforming is usually reserved for Destiny raid. I was able to complete this mini-dungeon by level 90. I wouldn't recommend tackling it before reaching level 70 or 60 as the minimum.
From the tree's root system that runs from the mainland to the tower, you will see two ladders, the second with an enemy right next to it. It is best to take care of those in range here to avoid the risk of falling off. Follow the root to the outcrop on the tower, then climb the upper of both ladders and climb up.
Do not ascend the second step immediately following the first. Instead, make use of Torrent to double jump over the space in the arched path that is to the right. Go up the ladder at the end of the path instead.
Proceed left from the top of the ladder and follow the path through the tower. Use Torrent's double jump to cross any gaps taking care as there are several that are difficult to spot coming. There's a spot of buy Elden Ring Runes grace at the end of the path.