This is terribly uncomfortable

You coil yourself and jump from one stone to the next. Hey! This isn't too hard. The warm, smooth stone holds steady and after a few jumps you find a bag - you'll have to open this later. After just a few more jumps, you find yourself on the edge of a new lava room.

Across the lava room stands a flat piece of smooth stone, so level and flat, it is as if thousands of paws had worn it over time. It looks cool to the touch and vaguely important. Surrounding it is a mote of lava, separated only by sharp stalagmites that impale it to point towards the open ceiling. There is no discernible path across. You know you must get there one way or another, but you're not sure you'll be able to go back the same way you came if you cross.

What do you do?