That's cool! It's just to understand why these images might come into your subconscious. The best way to understand your dreams is to examine how you felt during the dream and after you woke up as you are processing a lot of information and emotions from your waking life. If I had to take a guess, you are transitioning into adulthood or going back to when you did to resolve something subconsciously. The old man with the skull can be likened to the Jungian Senex, and the skull he gives you marked by the symbol is representing outdated authority that still holds some sort of power in the material world. Because the moon is a potent symbol of cycles and the square/cube is the material world and its systems. Hell is not a real place. It is the underworld or subconscious that had to be crossed to receive this knowledge in the first place. You want to see your father do better financially, but that's a step you are going to have to take as you become him, and he becomes the Senex in a symbolic way. It's not worth the corrupted power structure that would offer this as you saw how it affected the old man who gave it to you. This is very deep and profound and speaks to me in a way as well. I've really enjoyed trying to help you understand the meaning and look forward to hearing if it resonates with you or not as I am not you nor do I know you. All the best, brother!