Axioms & Anarchs is a 5E update of several Lawful and Chaotic planetouched races found in earlier editions of D&D. It includes the axani and cansin (introduced in Dragon #297, 2002), chaond and zenythri (Monster Manual II, 2002), and mechanatrix (Fiend Folio, 2003).
In addition to the standard version, each race is also presented as an optional subrace. The subrace version offers a few of the traits that the standard race possesses and can be selected in place of a typical subrace. For example, a dwarf with ancestors from Arcadia might select the axani or zenythri subrace instead of the hill dwarf or mountain dwarf subrace; an elf with ancestors from the plane of Arborea might select the cansin subrace in place of the high elf or wood elf subrace.
The document also begins with a brief summary of the lawful and chaotic planes, as described in the 5th Edition Dungeon Master’s Guide.