A very low-pitch xylophone from the lmms daw, with reverb, initially i was attempting to emulate footsteps, but it turned out to be somewhat sinister and eerie instead.
A sound effect to increase suspens in a horror game for example, can be used in a music aswell(it makes me somewhat think of a ping pong ball)created using audacity.
This is a loop that you can use to add tension or fear to any work you do. Feel free to use it with total freedom for what you like. Credits like: alex rmz.