2023 · ソースブック（プレイを拡張するルール／オプション）

BX Game Options Volume XII

This fantasy role-playing supplement introduces psionics, including rules for characters with natural abilities and a simple system for psionic combat. It focuses on the Telepathy discipline, with 32 powers covering memory access, mental influence, control, and other effects, plus rules for mental strain and psionic feats. A Psionicist class gains offensive and defensive powers and a pool of psychic energy as it advances. Optional rules also allow divine and arcane spellcasters to recover spells during the day through meditation, prayer, or study by spending faith or mana.