Usually, a room, although in rare cases, it would be another tunnel. The GM would roll on a table, but there would in fact be several tables, for different dungeon themes and styles, and there may even be multiple tables for one theme/style.
But here’s a generic approach: roll 2d6 on the table below. If the roll is doubles, use the information in the (If Doubles) column.
|2d6||Room Type||(If Doubles)|
|8||Kill Chamber||Flooded pit|
Doubles generally means a special version of the general room type: A 4 result means food prep (kitchen, fire pit) or food storage, but double 2 means a food source: a farm or animal pen.
Since a result of 2 is always double 1, it is always one specific result, On this table, it’s a room without a floor. Double 5 or 6 is a tunnel.
The “Special” doubles result next to “Storage” means it’s special storage, like an armory or library.
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