The Tyrelis stone is believed to be a relic of the faith of the Balts. This is evidenced by many things. Next to the stone is the so-called Devil's Island. The devil in Baltic mythology is the god of the dead world. The sources of the Mūša and Juodupis rivers are also here. The name Juodupis comes from the word "black", which means something dark, mystical, mysterious. Nearby is the village of Piktuižiai, whose name comes from the word "angry". In 14-15 C. with the advent of Christianity, the worshipers of the gods of the old faith had to go into hiding. So it is natural that the mythological stone lays in the middle of a swampy forest. Several man-made signs can be seen on the stone. We can see figures symbolizing an animal (it could be a deer or a goat). In the literature we can find information that a goat was sacrificed in order to calm the wrath of Piktulis (the ancient Lithuanian god Perkūnas).