I think the concept and originality of the story were its strongest points, especially Eredh's task to regrow the fallen as "soul forests". The concept of her anger affecting the forest was also interesting, though I think it could have been explored in the final sections of your story where you speak of Eredh's 'pure distilled hate' for the Wraith-Shard.
The writing was hard to follow in places - there's a number of typos and changes in tense which unfortunately pulled me out of the fascinating world you were creating. I imagine a revision of the story could go a long way in improving this aspect, if you're interested in improving your work after the competition's completion.
I wish a bit more could have been devoted to describing the unconventional weapon than the last paragraph of your story - perhaps more foreshadowing to the capabilities of the soul forest could have helped with this, or more detail of their fight against the wraith-shard.
Thank you for sharing this as part of the OPR Writing Jam!