Elden Ring: How To Get Ordovis' Greatsword

gamespot.com:

Elden Ring isn't lacking in weapon types from which to choose, but one player-preferred option is the greatsword. Among the best of these you can round up is Ordovis' Greatsword--particularly if you're willing to invest in a Strength/Faith hybrid build. This huge sword hits hard and has a unique weapon skill that helps it stand out from others in its class, but rounding it up is going to take a bit of work.

Ordovis' Greatsword is a greatsword that requires 25 Strength, 13 Dexterity, and 15 Faith to wield. It can dish out significant damage and can make quick work of enemies and bosses, especially once you've upgraded it a few times.

Perhaps the best part of Ordovis' Greatsword, though, is its unique weapon skill called Ordovis' Vortex, which winds up for a few seconds before slamming into the ground for a medium-sized AOE burst with huge damage potential. It can be charged for even more damage and only costs a little bit of FP, making it an extremely useful burst attack when enemies leave you an opening.

Ordovis' Greatsword item description reads:

Greatsword of Ordovis, one of the two honored as foremost among the knights of the Crucible. This sword is imbued with an ancient holiness. Its scarlet tint exemplifies the nature of primordial gold, said to be close to life itself.

Ordovis' Greatsword is found within the Auriza Hero's Grave, which is located near the northern entrance to Leyndell, Royal Capital. Unfortunately, this mini-dungeon is one hell of an undertaking, requiring you to dodge multiple rolling chariots that can kill you in a single hit. As you navigate your way to the bottom of the dungeon, you'll have to solve a variety of environmental puzzles to thwart the chariots and ultimately reach the boss fog