Cave of the Forlorn can be found in the ravine south of the Minor Erdtree in the Consecrated Snowfield. The entrance is guarded by a Giant Land Octopus. In order to enter the cave, players need to use two Stonesword Keys.

Enter the cave and you will find the Site of grace, near the entrance. Activate it. Head down to find a Golden Rune (7). continue long the way to find x4 Freezing Grease. Take the left path, roll to break the stalactites. You will find a few enemies there.  There is another Freezing Grease to be found, on a body inside a small room.

Return to the entrance room and now take the right path, once there, you can take a small alley on the left,  where there are a few misbegotten. Behind it you will find x1 Nascent Butterfly and on the other side of the room you can find x1 Golden Rune (10).

Head to the next room where you will find a Miquella's Lily on either side, as well as a few more scattered through the room, then use the snowy columns to reach the top and obtain x1 Hero's Rune (2). Head to the next room up the ramp to be greeted by another Misbegotten, head through the narrow path. You will find more Misbegottens here. You will find x10 Spiritflame Arrow and x1 Rune Arc on two bodies on a small room, again guarded by a Misbegotten.

Return to the previous room and by climbing again, you will reach a new area. Fall platform by platform, until you reach the lowest floor. Get ready to fight some Jellyfish.

Once you have cleared the room, enter through the hole on the ground. falling platform by platform again. You will obtain x6 Freezing Grease on one of the platforms. Once you are at the lowest level, you will be able to fight the boss, Misbegotten Crusader.

Defeat it to receive the Golden Order Greatsword.