Before you even enter the den, first you must get past the molten area, random spouts of fire all around. there's pools of lava that will occasionally boil over. If you're trustworthy enough, if you have the heart, the courage, then nothing here will come to harm you.

The sky, is dark, blotted out not by clouds, but my smoke, with very little sunlight able to pour in, you must watch out not only from the ground but above, for you are walking quite near and active volcano, that'll occasionally spit out molten rocks.

[got perfect photos at home for this too!]