Phase was a Force power that enabled the user to pass through matter, such as walls and doors.
An'ya Kuro was a known user of this ability. Bazel Warv could also use this ability when he was afflicted by his Force psychosis. After Bazel used it, Raynar Thul said that Killiks developed the technique while they created the Maw. Leia Organa Solo suggested that it was Celestials that developed the ability since the Killiks absorbed the memories of any being who became Joined to one of their nests.
- The Clone Wars Campaign Guide (First identified as Phase)