Past the Verse 3 room, stairs lead up to a portal into Ginnungagap, and Thule can't be reached again this run once you step through. Before you go, check you have the Figure Box and the Verse 1 Niflheim up the start platforms, the key and the Broken Witch Heart behind the seal, the Broken Moon Pearl from the broken bridge, the Card Pack, both Echoes of Memory, the crow, the Figure Box under the bridge and the Medallion Shard, along with the stone tower and stained glass Bewitchments. In the rift, one more Bewitchment asks you never to fall, so cross it carefully from the first step. A missed pickup can be collected later by replaying the chapter from Chapter Select once the chapter is finished.