Below Gwarnath – Map Generation Walk-through (Part 1)

As I'm finishing up the final sections of Level 1 of the Gwarnath mega-dungeon, I thought it might be fun and possibly useful to record the series of rolls I made to generate the dungeon from the tables in OSRIC. This is what I have generated so far...

I have zones O and P to complete on the Level 1 map, so this walk-through will be for zone O. As you can tell from the image below, most of the zones surrounding it are completed, so most of the routes into this zone are already set (lettered A-G in the order that I progressed to generate the dungeon). 

Zooming in to zone O, I decided to start in the north-west corner (the 10-ft. wide open passage from zone K marked 'A'). I'm using cardinal directions when referring to the extant map, but while generating the dungeon, directional descriptions become a little more complicated. The dungeon generation tables were built to facilitate solo play, so everything is oriented to how the solo player perceives the dungeon unfolding before them as they explore. Thus, the tables use the terms "left" and "right" to describe the dungeon from the solo player's direction of travel. In this case, the "player" would be traveling south down corridor A. From their perspective, "left" is west, "right" is east, "ahead" is south, and "behind" is north.

As corridor A is a continuing passage, we will roll on Table 18: General (in OSRIC) or on TABLE I.: PERIODIC CHECK (in the DMG). Both versions use a d20 to determine results, with some variations in % and outcome, but roughly the same format. 

We're using OSRIC v2 for these rolls with a few personal modifications, which I'll discuss as we go. The result of the d20 roll is a '15' = "Stairs." The table indicates that there is an immediate follow-up roll on Table 13: Stairs. A quick d20 roll on that table results in a '7' = "Stairs down 3 levels."

Since the first roll indicates "what's next" after the end of the continuing passage ('A'), I simply add 20 ft. to the passage length so as to accommodate the stairs, and then close off the end. I drop in the lines (which are 11 pixels wide, centered on the 1 pixel grid line – so 5 pixels to either side of the grid line). To draw the dungeon walls, I create an 11x11-pixel square using the rectangular marquee tool, filled with black, then I stretch the square to the desired length using the transform tool. This gives me a nice, consistent solid line that lets me line up and connect various wall segments, quickly and easily. For caves, I use an 11-pixel brush and free-hand the contours using Ctrl+mouse clicks.

Once the walls are set, I add a mask and insert the stairs icons, along with a key note to myself that these stairs go down 3 levels to level 4 (the 'v' is a directional indicator, not a letter). These results end this particular route into zone O, so we move on to the next access route 90 ft. to the east (labeled 'B').