If you could do that in any game weapons would probably be obsolete. Plus I wonder how would that impact Dark Souls Story & Gameplay.
Story wise if humans could create such fire then why would anyone worry about the end of The Age Of Fire?
Gameplay wise you probably defeat everything & indirectly cause a lot of Sins. PvP invasions would more annoying as you'd have to be the first one to kill someone with that power. And raises questions like if you destroy a certain painting how does that impact the Painted World Of Ariamis?
After doing all that research on magic my current weapon stats goal will be
Strength: 57 (Complete)
Dexterity: 24 (Complete)
Intelligence: 27 (After Faith)
Faith: 29 (Next Goal)
If I ever work on magic it'll probably be when Attunement is the only stat I have left to level up.
Personal Goals Achieved
I got a new Armor Set that isn't a starter set or from someone who isn't a (mini) boss. The Elite Knight Set in Darkroot Garden. I already got it up to +3 with Titanite Shards.
I easily defeated every Mini Boss in Undead Parish. I only remember dying once to the Prowling Demon there. I got a Tower Shield & a Black Knight Greatsword. I didn't get A Fang Boar Helm like I wanted. But such a Helm would've been temporary for me until I got Ornstein's Armor Set.
I met Andrei & Oswald.
Shortcut wise I now have an Elevator that goes between Undead Parish & Firelink Shrine. I also got that ladder down that leads to the first bonfire you can find in Undead Burg.
I learned the hard way that I now have a bridge to farm 555 Souls from. Because I lost over 10,000 Souls trying to run in the opposite direction that the Hellkite Dragon is perched.
I freed some guy who was going to escape anyway....