Part 3: The Frigid Spire

Enter The Frigid Spire and climb the spiral stairs. Use Voidwalker portals to reach the platform across the gap. Enter the door to the right.

In the next room, ignore the east passage and go through the north door. Kill the enemies in the hallway and use a portal across the gap to enter the north room.

After defeating enemies, return through the portal to be launched upwards. Use Deathgrip to grab the ring and reach the upper platform. Kill the ice skeletons and note the locked skull door. Go down the stairs and through the door.

Follow the passage, ignoring the west path for now. Find a chest in the first small room on the right. Step on the pressure plate to open gates.

Activate the Voidwalker pad behind the opened gates. Enter the room to the left, defeat the ice stalker and champions to unlock a grate. Activate the portal pad on the wall and jump through.

Enter the door to the right. Use Voidwalker portals to reach a hanging pole, then use the portals again to reach a higher platform.

In the long rectangular room, a scene will play, followed by a fight with a frost weaver and ice skeletons. The south door will open after the fight. Drop down.

In the room below, place charged portals on the floor pads flanking the movable block. Push the block into a portal to make it bounce. Climb to the upper ledge using handholds.

Face the center of the room. Use Deathgrip to pull the bouncing block across when it pops up. Push the block against the north wall, jump on it, and wall run to grab upper handholds.

Drop to the upper ledge and throw the switch to open gates below. Drop down, ignore the lantern in the west alcove for now. Grab the box used to reach the switch and push it into the hallway, dragging it north and then right, placing it against the wall below a portal pad.

Return for the lantern, drop it near the box. Climb the box, activate the portal, and activate another portal pad above the blocked east doorway. Deathgrip the lantern up and jump through the portal.

Drop into the previous room and go to the west passage. Place the lantern on the pressure plate to open the gate. Pull the lantern across with Deathgrip, climb the stairs, and give it to the statue.

After activating the statue, activate the portal pad visible through the window to the left. Rotate the statue twice to face the stairs. Activate the Voidwalker pad hit by the laser to unlock a door. Enter the unlocked door and wall run across the gap.

Open the chest to the left. Enter the main room and open the chest on the north side for a skeleton key.

Return to the main room and fight the frozen enemies. Defeat the ice stalkers that attack to unlock gates. Go up the stairs to the east, pull the lever to open a gate, and use the skeleton key on the door. A scene and boss fight will follow.