The Knights of the Crucible are among the toughest foes in the Midlands. This could cause the knights to end your current run before you have time to think. They use a combination of powerful attacks and enchantments that most other enemies don’t have access to. As well as being strong, these enemies are dexterous enough to move at high speed and can take a lot of hits before going down. Fortunately, you get some awesome items to defeat them all. This is where you can find all the Crucible Knight bosses in the Elden Ring.
Limgrave
The first of the Knights of the Crucible can be found in Limgrave and you can reach the boss shortly after entering the world. Just go to Stormgate and go up the hill. After reaching the top of the hill, he turns left and heads south. You will find an Evergaol. Use Everygaol and it will teleport you to the Crucible Knight boss arena. Defeat this knight to get the Crucible Skins: Tail Enchantment.
Fallen

If you decided to head east from Limgrave, you may have ended up in the barren landscape of Caelid. Head to the southeastern edge of Caelid to find Redmane Castle, home to one of the bosses of the Knights of the Crucible and the Radahn Festival. When the festival isn’t running, you can go to the Chamber outside the Grace Plaza Site to access the boss fight against the Crucible Knight and the Misbegotten Warrior. Defeat this pair of bosses to get the Ruins Greatsword.
outskirts of the capital

To the north, on the Altus Plateau, you can find a couple of Crucible Knights that are quite difficult to deal with. These knights can be found in the hero’s tomb of Auriza on the outskirts of the capital city. This dungeon is difficult to get through thanks to the carts roaming the halls and the boss fight against Crucible Knight Ordovis and his counterpart doesn’t make it any easier. Defeating this boss will net you the Ordovis greatsword and the Crucible Knight armor set.
deep depths

The final Crucible Knight boss fight you may run into is against Crucible Knight Siluria. This boss is very tough and wields a spear instead of a greatsword. To get to Deeproot Depths, you will need to go to the bottom of the Capital City sewers where the Three Fingers are located or use the coffin at the base of the waterfall after beating Valiant Gargoyles in Siofra River. For beating this boss, you will get the Tree of Siluria, a powerful spear that is excellent for PVP and PVE play.