Run or fight the large Golem enemies, using the rocks and massive fallen tree branches on the ground as cover from their greatbows. Rest at the nearby Deep Siofra Well Site of Grace, then get on Torrent and ride through the valley to your right. Once you're at the top, you'll find yourself in Caelid. Next, use two Swordstone Keys to break the seal and activate the elevator. Once there, proceed directly north until you reach an elevator sealed by an Imp Statue. To reach it, you'll need to head to the underground Siofra River area that's accessible via the elevator in the Mistwood forest, found in eastern Limgrave. Open the doors and walk inside to unlock it.
If invaded by the Recusant Henricus NPC, kill him and continue north until you see the colosseum structure. To find the Limgrave Colosseum, go east of the Stormhill Shack Site of Grace until you reach the Warmaster's Shack Site of Grace. Here, we'll offer more detailed (and spoiler-filled) information on how to find Elden Ring's new PvP arenas. Finally, the Royal Colosseum is located at the southernmost point of the Altus Plateau, within the region's walled city. The Caelid Colosseum is in northwestern Caelid, west of the massive tower players can see in the northern part of the area. You'll find the Limgrave Colosseum in northwestern Limgrave, east of the large castle that's visible at the northwesternmost point of the region.