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D&D knows Mimics and their relatives, the Lurker and Trapper. They are aberrations that mimicpun intended the floor and ceiling and have been used in conjunction with a stunjelly for years to make a room that lusts for adventurers to eat. Yes, the room will eat you. For example in this 2010 Screamsheet blog post describes "The Room of Death" with many more monsters for Pathfinder, but I was very sure I have seen an older internet page that discussed the two aberrations with the stunjelly in an empty room configuration. After a quick search I could find where I had read it first: Jared [von] Hindman's 2006 article ranting about 30 years of stupid monsters includes the (empty) Room of Death but labeled it as "Trinity of Dungeon Terror".1

Other terms for such a setup I have seen or heard in discussions are Living Room, Killer Room and Room of Doom.

Has there ever been a pre-2006, official Dungeons and Dragons supplement, or Dragon Magazine article that employed the idea of the killer room that wants to eat you, consisting of 3 different monsters that make up the ceiling, wall and floor? The most iconic combination seems to be Lurker, Trapper and Stunjelly but the first mention might have used other monsters.2


1 In fact, I used his articles to build a house filled with monsters that imitate items to try to eat you but that's beside the point.

2 A single Greater Mimics doesn't count. Neither does a House Hunter Mimic or a set of 3 mimics. It must be 3 monsters with different stats making up the ceiling, floor and walls.

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  • \$\begingroup\$ Is that one monster making up all (presumably) four walls? and one more each for the floor and ceiling? \$\endgroup\$ – nijineko Aug 9 at 3:27
  • \$\begingroup\$ It might be helpful to know why you have these specific requirements. Like, why exactly 3 different monsters? \$\endgroup\$ – WakiNadiVellir Aug 9 at 8:09
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    \$\begingroup\$ @WakiNadiVellir Because that's the Jared von Hindman's Trinity of Dungeon terror, which seems to have been pivotal in getting the Room of Death popular. \$\endgroup\$ – Trish Aug 9 at 9:11
  • \$\begingroup\$ @nijineko yes, the stunjelly was making all 4 walls, the floor and ceiling are separate monsters. \$\endgroup\$ – Trish Aug 9 at 9:11
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    \$\begingroup\$ So, if I understand correctly, the one-sentence question here is "Has Jared von Hindman's Trinity of Dungeon terror ever been described in a pre-2006, official Dungeons and Dragons supplement, or Dragon Magazine article?" \$\endgroup\$ – WakiNadiVellir Aug 9 at 9:56
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Almost.

Tom Moldvay's 1981 D&D module X1 Castle Amber has a room that comes very close to reaching your requirements.

Area 8 of Castle Amber--"Servants' Quarters"--is a 20'x20' room with one entrance. The floor is entirely covered by a green slime, the ceiling is entirely covered by a black pudding, and a stone platform raised 2' above the floor has a grey ooze on it. There is a stone chest on the platform (the bait) which contains a generous treasure.

So the ceiling, floor, and 3-monster requirements are met, but it does not meet your wall requirement. Despite the shortcoming, it is possible that the Castle Amber room was the original inspiration for later "Killer Rooms," "Rooms of Doom," or "Rooms of Death."

NOTE - I realize that in later editions, green slime becomes a hazard rather than a monster, but in 1981, green slimes, black puddings, and grey oozes were all monsters.

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Yes, but are you willing to upscale?

The old adventure Return to the Keep on the Borderlands (1999) contains as a possible wilderness encounter one "Shy Tower", a mysterious tower which appears and disappears and is actually...

a gargantuan cousin of a mimic which has taken the form of a three story tower, and would simply love for you to come inside and be eaten.

This fits the general desire you expressed, and with only a modicum of tweaking (such as three younger, smaller, not full room sized specimens) should work well. Perhaps three such creatures of different ages, and thus slightly different stats.


There is also a certain gazebo, though it started as a misunderstanding, it has since been elevated into the history and lore of D&D as a venerated monster. Some gazebos are room sized, so if you don't mind the somewhat humorous take, then it might work too.

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    \$\begingroup\$ (Psst! The question says, "A single Greater Mimics [sic] doesn't count. Neither does a House Hunter Mimic or a set of 3 mimics." Also, Steve Jackson Games's Munchkin Monster Manual includes 3e stats for the gazebo (10–11).) \$\endgroup\$ – Hey I Can Chan Aug 9 at 4:11
  • \$\begingroup\$ @HeyICanChan That's why I said three monsters, and not a single one? They didn't say that three Greater Mimics didn't qualify, after all. \$\endgroup\$ – nijineko Aug 9 at 14:39
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    \$\begingroup\$ Actually... "It must be 3 monsters with different stats..." \$\endgroup\$ – Trish Aug 9 at 16:29
  • \$\begingroup\$ And different ages of monsters will have different stats, obviously. My suggestion meets all of the technical requirements of the question. Though perhaps it does not meet the spirit of the request, it does meet the letter thereof. \$\endgroup\$ – nijineko Aug 9 at 16:30
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    \$\begingroup\$ @nijineko Not really. The request asked for an official source where three discreet monsters were used to make a room of death. You offered an official source where one monster made a room of death and then suggested that two more monsters could theoretically be added to make your example fit the request. My also imperfect answer would have met the criteria too, if I was allowed to move the gray ooze from the platform to the walls... but that's not how the published source described the room. \$\endgroup\$ – ruffdove Aug 10 at 20:22

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