2018 · ソースブック（プレイを拡張するルール／オプション）
Frontiers of the Empire
An optional rules supplement for D&D 3.5E or 5E, adaptable to other roleplaying systems, focused on exploration at the dangerous edge of civilization. Players venture into ruins, wilderness, and monster-infested sites, encountering strange beasts, hostile tribes, and supernatural threats while seeking valuable rewards. The rules provide stronger incentives to explore, take calculated risks, and interact with outsiders rather than treating every unknown as an immediate enemy. They can also support campaigns with multiple game masters and large groups of players operating from a small city-state or frontier settlement.
属性／ステータス制（STR、CON、PERなど）レベル制（XPを獲得してレベルアップ）ダイス（主にd20）
ゲーム情報（人数、プレイ時間、対象年齢、クレジット）の出典：BoardGameGeek。