Uploaded August 2026 | Updated September 2026, 2 weeks ago
The gelatinous cube in B/X D&D isn't a joke monster — it's the most precisely engineered entry in the 1981 Basic Set, and its ten-foot dimensions are the mechanic, not the flavor text.
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Moldvay drew B/X dungeon maps at ten feet per square. He wrote the rule that says two or three characters can fight side by side in a ten-foot corridor. Then he wrote a monster that fills that exact volume, wall to wall and floor to ceiling.
This one goes line by line through the B/X Basic Set entry — surprise on 1-4 against a baseline of 1-2, the thirty-foot torch radius that does the hiding for it, Move 60' set to the speed of a fighter in metal armor carrying treasure, paralysis for 2-8 turns against a wandering monster check every 2 turns, and the Number Appearing line that proves the cube was never meant to sit in a room.
Sources are the Moldvay B/X Basic rulebook (1981) and the D&D Rules Cyclopedia (1991), which reprints the entry without changing a single number.
The Tavern Rules: We’re here for B/X and OSR gaming. I use AI as a tool to help organize and format my notes, but every ruling and opinion is 100% Tenkar. Keep it civil, keep it old-school, or the bouncer will show you the door.
Basic Rules (Moldvay) PDF & Print - drivethrurpg.com/en/product/110274/d-d-basic-set-rulebook-b-x-ed-basic?src=newest_print&affiliate_id=1446
Expert Rules (Marsh/Cook) PDF & Print - drivethrurpg.com/en/product/110792/d-d-expert-set-rulebook-b-x-ed-basic?affiliate_id=1446
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Master Minion: mortgagemike77, Randt Chrockett, Eric Fox, The Veteran DM, Cathulhu17, Don Bakke, DoubleDeuce, skink, Kore44, Louis Feurino, Craig Aylward, Anthon Kron, Ijimisan, Terry Taylor, blahlbinoa, Arbiter's Archive, Dean Salsberry, DM Angelo, Douglas Pearson, James Spahn, Mathew Sherman, Agile Monk
Companion Minions: Andrey Zharinov, Brett C, Spode Racing, Tacoloco787, Adam Lovell, Plush Cthulhu, DM_Sahrenyth, Gabe Guerrero, Chris Charlton, Chris Blatnick, Nicodemus ShadowCaster, Christopher Beattie, No one, Stephen Klow, Mark the Shark, Eupolemos, Jay, Martin Penny, tim cafferty, Rubens Barrichello, Curt Gould, Estaban Vasquez, Glen K. Amo
youtube.com/channel/UCIdpAASpAI7vu-bZx6pP_mQ
#OSR #DnD #BXDnD #TTRPG #TenkarsTavern #GelatinousCube
The gelatinous cube in B/X D&D isn't a joke monster — it's the most precisely engineered entry in the 1981 Basic Set, and its ten-foot dimensions are the mechanic, not the flavor text.
🔥 JOIN THE MINIONS: youtube.com/@TenkarsTavern/join
Moldvay drew B/X dungeon maps at ten feet per square. He wrote the rule that says two or three characters can fight side by side in a ten-foot corridor. Then he wrote a monster that fills that exact volume, wall to wall and floor to ceiling.
This one goes line by line through the B/X Basic Set entry — surprise on 1-4 against a baseline of 1-2, the thirty-foot torch radius that does the hiding for it, Move 60' set to the speed of a fighter in metal armor carrying treasure, paralysis for 2-8 turns against a wandering monster check every 2 turns, and the Number Appearing line that proves the cube was never meant to sit in a room.
Sources are the Moldvay B/X Basic rulebook (1981) and the D&D Rules Cyclopedia (1991), which reprints the entry without changing a single number.
The Tavern Rules: We’re here for B/X and OSR gaming. I use AI as a tool to help organize and format my notes, but every ruling and opinion is 100% Tenkar. Keep it civil, keep it old-school, or the bouncer will show you the door.
Basic Rules (Moldvay) PDF & Print - drivethrurpg.com/en/product/110274/d-d-basic-set-rulebook-b-x-ed-basic?src=newest_print&affiliate_id=1446
Expert Rules (Marsh/Cook) PDF & Print - drivethrurpg.com/en/product/110792/d-d-expert-set-rulebook-b-x-ed-basic?affiliate_id=1446
Join The Tavern’s Discord Server (It's Free):
discord.gg/fReGmuD
Buy me a Beer!
ko-fi.com/tenkar
The Tavern uses affiliate links - using our affiliate links supports the channel without costing you anything extra.
Humble Bundle: humblebundleinc.sjv.io/da4WJ2
The Tavern’s Amazon Storefront: amzn.to/41Jm0oG
DriveThruRPG: drivethrurpg.com/en/?affiliate_id=1446
Fantasy Grounds VTT: affiliates.fantasygrounds.com/388855/15958
The Tavern uses Restream for its livestreams and its long-form videos. You can too! restream.io/join/g5Qpgr
The Tavern also uses VidIQ: vidiq.com/TenkarsTavern
Master Minion: mortgagemike77, Randt Chrockett, Eric Fox, The Veteran DM, Cathulhu17, Don Bakke, DoubleDeuce, skink, Kore44, Louis Feurino, Craig Aylward, Anthon Kron, Ijimisan, Terry Taylor, blahlbinoa, Arbiter's Archive, Dean Salsberry, DM Angelo, Douglas Pearson, James Spahn, Mathew Sherman, Agile Monk
Companion Minions: Andrey Zharinov, Brett C, Spode Racing, Tacoloco787, Adam Lovell, Plush Cthulhu, DM_Sahrenyth, Gabe Guerrero, Chris Charlton, Chris Blatnick, Nicodemus ShadowCaster, Christopher Beattie, No one, Stephen Klow, Mark the Shark, Eupolemos, Jay, Martin Penny, tim cafferty, Rubens Barrichello, Curt Gould, Estaban Vasquez, Glen K. Amo
youtube.com/channel/UCIdpAASpAI7vu-bZx6pP_mQ
#OSR #DnD #BXDnD #TTRPG #TenkarsTavern #GelatinousCube
