i dear friend, welcome:)
the bone the imp needs ( i think it's a tooth), is given by a especific monster on that level. you need to find a room locked, if i remember well that lock opens after you click on the burning torch near the door. inside you will find the monster, when it dies, you will see that "Bone"!:)
cya
Was there a clue or something that you figured out that you had to click on a torch?
Tsel
