You must slay five named giants in Permafrost to obtain their pieces.
Commander Keg spawns at ( 85, 25, -70 ) /waypoint 85, 25, -70 He is on the top of the tower. His place holder I think is a 47^^^ Kromise Curn Avenger. I've also seen him spawn near the base of the east tower where Knubed/Skullsplitter spawns; -99, 0, -130
crux of Skullsplitter - Terook Skullsplitter at ( -86, 26, -96 ) /waypoint -86, 26, -96 Again on top of the tower, the eastern one - this one you have to go via the right hand spiral up to get out. His placeholder is a 48^^^ Kromise Rem destroyer. Terook Skullsplitter is 48^^^ and is grouped with a 48^^^ Kromise Rem watchman and a 48^^^ Kromise Rem cassok.
Chillwind's hinge - Kerhn Chillwind at ( 0, 41, -236 ) /waypoint 0, 41, -236 He's on the top middle balcony. His placeholder is a 47^^^ Kromise Virh devastator who will appear on either the right or left side of the balcony. Kerhn Chillwind is 48^^^ and appears in the middle of the balcony grouped with a 48^^^ Kromise Virh armsmen on his right side and a 48^^^ Kromise Virh mender on his left side.
Frigidbeard's Shard - Ador Frigidbeard at ( 0, 60, -271 ) /waypoint 0, 60, -271 At the circular area outside Drayek's Chamber zone in. Ador os 50^^^ and is grouped with a 50^^^ Ikro Kromise cleric and a 50^^^ Ikro Kromise protector. His placeholder is an Ikro Kromise isangoma.
Gyrok's Brand - Gyrok Deepfreeze at ( 0, 60, -385 ) /waypoint 0, 60, -385 Right infront of the Drayek's Chamber zone in. Gyrok Deepfreeze is 50^^^ and is grouped with three 50^^^ Ikro Kromise champion's and a 50^^^ Ikro Kromise cleric (two on his right side and two on his left side). Gyrok has a knockback that can knock you over the center wall and down to the bottom of the circular ice staircase. It's best to fight him with your back to the door.