2020 · ソースブック（プレイを拡張するルール／オプション）

Expanded 20-Level Core Four Classes

An expanded rules supplement for Labyrinth Lord and Advanced Labyrinth Lord that advances the four core classes through 20th level. Clerics gain additional divine powers and ritual magic, fighters develop battlefield dominance, multiple attacks, weapon specialization, and heroic surges, and magic-users receive expanded spellcasting abilities, counterspells, enchantments, and high-level arcane powers. Thieves use a revised ability system that allows individual skills to advance at different rates, alongside abilities such as backstab, read languages, read scrolls, and skill specialization. Optional special skills include acrobatics, dual-wielding, locksmithing, trapsmithing, ventriloquism, and other specialized talents.