Ops and Tactics: Supply Drop Volume 08 (Archetypes and Race Construction)

From the introduction: Ops and Tactics begins with Archetypes designed to provide as much freedom as possible while still remaining unique, but they are limited in their function. This supply drop (Volume 8) adds a new archetype to the core ruleset, a variant archetype that is classless, and the ability for players and GMs to build their own races.