An Amaranth is a golden sphere about the size of a Cricket ball. It serves to stabilize the interior of a TARDIS from the de-rationalizing effects of the Eye of Harmony. It is capable of rebuilding small areas of the Universe along rational lines using its own very high Reality Quotient. If the Amaranth finds itself surrounded by a dangerous amount of irrationality, it will teleport its user to a safe location. The Amaranth (or similar technology) might also be used by the Chaotic Limiter in a War TARDIS to alter the reality quotient of time travelers. (see Time War Addendum).