The first chapter gave me hope that it wouldn't be a "secret power that no one knows because of no investment."
From what I got out of it, the blacksmith is capable of pulling out any weapon because, well, he's a blacksmith. Though since blacksmith is a crafter class, there's no way it even compares to the firepower of standard warriors and paladins. It seemed like skill, and yes, a few secrets (not too op), made him capable of such feats.
But now, investing all his points in luck. It's just... disappointing.
This series reminds of Legendary Moonlight Sculptor. Although in that one, while yes, the main character gets a secret class that no ones knows, the author presents his character as someone who has worked his ass off to get to where he is, and is capable of making up the "sculptor" side in combat. He gets new, powerful skills, but not without restriction. I recommend it, but take note. The longer it goes on, the more you find it repetitive.
On the other hand, there's also hardcore leveling warrior who basically has the same skillset as our main character here, but I feel HCLW does a better job than this (granted since the licensing I haven't been following the series. really should read it again). Though I suppose this is because the MC is presented as a veteran player, so him understanding the secrets and knowledge behind skills and interactions makes sense. That, as well as the fact that as far as im aware, he doesn't avoid every single attack because evasion is apparently using solely luck. That along with critical hits being practically 100%. I don't see any of that on him. He really just gives off the vibe of a veteran player with a gambling skillset, versus this guy gaining immense power because. you know. 99.9% chance for crits, evade, and loot bonus?
I guess i'm judging the series too hard at chapter 7. but my thoughts are there.