2013 · ソースブック（プレイを拡張するルール／オプション）

Field Manual: 3145

Set in 3145, thirteen years after the collapse of humanity’s interstellar communications grid, this reference surveys the political and military state of the Inner Sphere as war spreads across its realms and Clans. It includes a brief history of recent events, current force organizations for major ’Mech units and mercenary commands, and era-specific rules for creating characters and forces for campaigns set during or after this period.