While carrying this stone you are unnafected by natural enviromental effects such as extreme cold, extreme heat, strong wind...

You also gain the ability to:

Control Weather: (1/day) For 5 miles around you, you can change the weather, wind and temperature to whatever you want (lasts 24 hours). If you do this just as the moon is rising for 30 consecutive days, with the same weather every time, the area expands to 50 miles and the effect becomes permanent.