Metamancer

If this doesn't work, try seeing if Walder appears on the auto-map.

Command him to pose mightily, and then call out to walder in stimperspeak.

I'm going to guess that that's a map. Which it probably is, seeing as the bit we have matches with it.

Uh oh. Where are our friends?

Cool!

Examine light source on floor.

What about left one room, left one room, upleft one room, etc?  One arrow per room. Based on the map I think that would put us left/downleft to the blue room without running into any walls that we know of.

Walk in, Then strafe 2 steps to the left, the take one step forward and to the left, Strafe two steps to the right, walk 1 step forward and slightly to the right, then Take one more step forward and to the left.

How are you interpreting the arrows? I need specifics.  --Metamancer

We really need to figure out how to replenish our various abilities. I guess for now we should head into the darkness, and head in the direction the arrows on the sign indicate?