2018 · ソースブック（プレイを拡張するルール／オプション）
The Sisiutl
This aquatic racial supplement introduces the Sisiutl, a two-headed player character option for the Cerulean Seas Campaign Setting. It provides rules for two players to share one character without adding another character sheet, miniature, or set of statistics, along with guidance for using Sisiutl as non-player characters. The supplement details their abilities and supports underwater adventures.
スキルベース（スキルを購入または獲得）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）
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。