The Teufelsstein, which gave the hill its name, is a rock formation about 2.50 metres high and up to 4 metres wide. Five steps have been carved into the rock, staircase-fashion, leading to the top where there is a hollow which is thought to be a sacrifice bowl (Opferschale) for religious rites of its former, probably Celtic users and from which a blood channel (Blutrinne) runs down the rock by the steps. In addition the rock has numerous symbols carved into it, dating to various periods. As well as sun wheels, runes and Roman letters there are several markings that recall the stonemason's marks of the 12th and 13th centuries. According to older accounts, two coarsely drawn human figures as well as other carvings used to be visible as well, but they have since weathered away or been deliberately destroyed. In the near vicinity of the Teufelsstein are several large rocks which could be the remains of a former enclosure of the summit plateau.