Pfahl means "Stake," perhaps pertaining to the pointy teeth trying relentlessly to eat the sky. Quite strangely, these formations are of both granite and bright quartzite caused by a rare tectonic action. Actually, only a few of these "stakes" are we lucky enough to have above ground. Bolting has been banned here, so use what are left of rusty old bolts and pitons, and place the rest of the pro in what cracks you can find. Many have glue in top anchors, some do not. Many people top-rope here.
From Regensburg or Passau: Take the A3 toward Deggendorf, get off at Deggendorf and take the 11 to Pattersdorf, then take the 85B to Viechtach, leave town and pass a swimming pool, then a campground, after which there is a long parking lot/cut off, on the left (south) side of the road. Park here and walk across the road to the first obvious trail, this will take you to the Pfahl.