A collection of monsters for old school D&D, and clones. Each entry has two sets of stats, one for 0e/1e (Original or Advanced D&D), and the other for B/X (Basic D&D).

Has the following monsters: abysmal, adarna bird, airwalker, aqraseth, arassas, aziza, arctic (ice) bat, death bat, batar, giant flayer beetle, bestial beast, biloko, bloodbeast, bloodgill, brain bat, braincrab, buru, c cactus cat, cacus, cadejo, calytaur, cyprian centaur, chötgör, cow demon, cyclorc, d devil monkey, dingonek, djetabi, greater dobarchú, lesser dobarchú, donestre, dover demon, dracopede, dragi, wooly dragonboar, draugr, dunter, black dwarf, red dwarf, dzee-dzee-bon-da, e eagle hound, mudmist elemental, sand elemental, white elephant, eloko, emerald stinkbug, fear liath, fetch, filth licker, fire fox, firewalker, flash dragon, fluxbug, flying head, gaseous lantern, dirt giant, phase giant, canine (flesh) golem, giant spider gorilla, gowrow, guardian bramble, hayra, heikegani, hibagon, hsigo, hyrcinian bird, ipotane, izzoo, jelly death, jenglot, jogah, kala, kam warrior, khiimori, kraben, leech-man, leogryph, leshii, nephil lich, liger, linnorm, lithopede, giant trapper lizard, longma, lympago, mapinguari, mind hunter, mind moth, giant molecricket, mothman, razortooth hammerheaded muckwing, mudloc, animal mummy, raja naga, nightmander, octoman, ophiotaurus, orling, oxyx, pink slime, possessor, psi-bat, pukis, pukwudgie, qiqirn, quickslime, rarog, gargantuan rat, ratatoskr, red ether, revolving beast, rotmouth, russet pudding, saleerandee, white scorpion, shock snail, ruby skeleton, rupture skeleton, stone skeleton, skinkman, skinwalker, skunkbear, skyfish, giant two-headed snake, snatching serpent, giant trogloraptor spider, spindler, flailing spirit, dohma sprite, stinking pile, striga, symaru, taega/taerga, tangleworm, bone tarantula, taroltula, thuzzendahg, tiddy mun, tukkator, üuloch, vittora, vulbat, wampcat, whipwhirl, whitewinder, giant woodpecker, carriage worm, crimson death worm, rider worm, sanju worm, sarcophagal worm, wyrdwun, xanther, yak-man, ymir, youree, zagh, and zathoa.