From publisher blurb:
Colours of Magic: Red Fifth Edition Update
A Spectrum Shift: Chromatic Arcana Product
In some worlds, Magic may not be seen as a force in and of itself. In some philosophies, magic can not be classed by types of effect, like Evocation, Illusion or Abjuration. Instead, it might be seen as a result of fundamental aspects of arcane metaphysics.
One such theory holds that all magic is a result of the principles of Colour.
Blue is the colour of Magic and Symbols. It is concerned with an understanding of the order that underlies the universe. From concept to form, idea to reality; the nature of the organization of That Which Is, is the matter that Blue magic seeks to comprehend and manipulate.
Those that devote themselves to understanding the Blue are able to manipulate spells, runes and symbols to the point of being able to reshape how magic re-orders the universe.
Included in this product:
3 new Class options, one for each of Cleric, Sorcerer and Wizard
a reclassification of one eleventh of the spells of the players handbook