2021 · ソースブック（プレイを拡張するルール／オプション）

Fuel: A Spark Module for LIGHT

This module establishes a repeating gameplay loop for LIGHT, with Beacons undertaking Strikes, recovering through downtime, and returning for further missions. It provides four Strike types and guidance for GMs on structuring their elements and challenges. After each Strike, players roll on loot tables and receive engrams that can generate random weapons or be exchanged with Vulcan for favor. Favor allows Beacons to customize or build weapons, while structured advancement provides additional ways to improve characters and stats. Rules for repeated runs increase the chance of finding Strike-specific loot.