Duch Gór (The Mountain Spirit), also Karkonosz, Liczyrzepa - he is the legendary lord of Karkonosze mountains, he is responsible for the weather and atmospheric phenomenons in mountains, so he is often considered as the helper of travellers but if travellers anger him then there can be very dangerous since his wrath is unpredictable. J.R.R. Tolkien's Gandalf was based on The Mountain Spirit.