Set in a steampunk to modern era, A newly recruited soldier who matures into a ruthless mercenary must learn to face his demons in order to slay the barbaric and malevolent Kakos that threaten mankind with 7 swords of sin bestowed upon him by the gods.

Thanks for the feedback guys. I did a little bit of editing and dusting up here and there and it's a little more clearer now. It should be even more clearer with the feedback you guys gave. Thanks!

I love steampunk, too, but for the reasons Valentin raised, I can't get a handle on the main character nor on what the story is about. And what "kakos" are may be obvious to a person versant in Greek, but most people aren't. I had to google the word -- but I shouldn't have to.

I love steampunk novel and graphic novel. Personally I am not a fan of fantasy (too many repetitive quest going nowhere with a final deus ex machina to resolve the inextricable threads), but I can see that you mix both steampunk and fantasy genre.
The good thing about the logline is that the genre and setting is well defined. Now the bad.
All the rest. We know nothing.
Who is the hero? Instead of newly recruited soldier use a novice soldier.
Why must learn to face his demons? What kind of demons does he has? What has happened in the past to make feel that way? Grief-stricken, feeling guilty, feeling abandoned ...?
When does he mature into a mercenary? Before the quest, during the quest? If it is before the quest, the hero starts not a novice, but a cynical mercenary. If it is during the quest, then we have a transformation/maturation during the movie and we don't need to know that. It's a given that a novice soldier will become an experienced soldier later. In every quest you get better or you quit/die.
What does the hero want to accomplished? What is his goal?
Who is trying to stop him? BTW, as a rule unless the character is an historical figure logline don't contain names.
How can seven swords of sins threaten humanity? Is it a special weapons? Replace that by a mythical ultimate weapon.