I was going to go with my first idea of a dice, how ever I was thinking that it would be too easy to make and not add enough of a challenge.

And so I made a new idea of a tree with a hang man's noose, the reason was because it added enough of a challenge to test my skills at making them, and it added the dark twist that I wanted to my set.

Elements

I have used Form on the dice so that it looks 3D and I have used lines to make it stand out, and add to to the 3D effect.

I have also used value and line to define and add detail, especially to the noose.