I think you make a great job of building a story in a relatively short amount of words @gwilberiol. I particularly liked the descriptive language in how you described the mecha armor warrior and was also impressed with the level of development you managed given the word limit. As @calluna says, this does read like a great beginning to a longer series, I'd definitely read more and want to know where the legend takes our hero.
Great entry :-)
Now what am I going to reply after your comment and that of Calluna?