Amaranth

An amaranth was a device created by the Time Lords to find unstable or discontinuous elements of the universe and to rebuild them along more rational lines, (PROSE: Christmas on a Rational Planet) along the lines of the established laws of the Spiral Politic. (PROSE: Against Nature)

The first amaranth was created by maintenance engineers on Gallifrey to help counteract the warping effects caused by the black hole on the spacetime continuum. It contained an emergency function to transport its user to a more stable part of space. (PROSE: Christmas on a Rational Planet)

After the Jallama Reed initiative, Ordinance-Tetrarch Goralschai believed that amaranths were useless to those who lacked imagination. (PROSE: Against Nature)

The Doctor once possessed an amaranth. (PROSE: Christmas on a Rational Planet)