Which explains why the RAW require enchanted weapons to have a non-magical bonus no more than five less than the desired magical bonus. Blade I, however, does not create an enchanted weapon in the normal sense, although it does "grant the weapon a +5 magic bonus".
The thing is, that all too often in games, the world is not a monolithic tech level. . .a spread from stone to high steel II can easily be in play, does that mean that only superior crafted stone/copper/bronze items, which reach a 0 bonus, can then be enchanted to +5, while any old Iron piece can be enchanted to +5, and a rusty/bent high steel blade to +5?
I understand why that rule was added, I just find that while it helps limit excess in bonuses it leads to other problems. . . .I have yet to find a bonus stacking rule I'm completely happy with.
On the other hand, temporary boosts always stack on top (so the priest mumbling over you before combat will add +5 to any weapon be it -10 or +10) giving a separate logic for temporary enchantments.
Or the logic expressed in this thread of -15 to me, +15 to you semi-permanent enchantment creating a 3rd logic of stacking.
If I had a clean and clear logic that worked for them all, I'd be happy, but I have yet to see a stacking rule that didn't create some goofy results, or smack of "rules by exception" ala "one rule for these, a separate one for those, and yet another for this one." <shrug> I'll be a happy man when someone comes up with an elegant answer on this one.
Of course it seems illogical when you try to take it to the most outrageous extremes, that is why it is called "outrageous extremes". A twig as a club? an origami battle axe? Please. Any GM who allows such absurdities likely deserves any problems that he gets.
Now personally, if you have a weapon that has a negative modifier based on the material it is made from, that is going to be a functional and relevant modifier regardless of what sort of magical bonus it has.
Take your origami battle axe. Being made of Paper (as opposed to the iron or steel that it SHOULD be made of), you will, IMO, ALWAYS have that -100 modifier due to material, regardless of the magical bonus, Thus it would end up as -80 rather than +20.
While material and quality bonuses are often combined because they are non-magical, it needs to be remembered that they are still 2 different modifiers. It also needs to be remembered that the attack tables are built around the concept of weapons are made of certain materials, and to certain specifications (length, weight ranges, etc).
If a "weapon" does not meet those basic construction standards, then it will receive a minus on the attack table (or not be allowed at all) regardless of what sort of bonuses it might have. And if the modifier is based on the material, then unless the spell that created the item (or the item's description) specifically states otherwise, it should always receive that negative modifier, regardless of what bonuses it has or where they come from.
Hyperbole and extremes are the easiest way to demonstrate flaws, on smaller scales they are less amusing but equally problematic.
So then a Bronze (-10), Iron(0) and Steel(+10) dagger, all enchanted to +10 result in weapons that are 0, +10 and +10? So stack on the downside but not on the upside, despite the fact that the steel dagger is as superior to the iron dagger as the bronze dagger is inferior to the iron dagger, on the same standard, measured on the same scale? I think that's illogical. Either the material bonuses should stack, or they should not, saying they only sometimes stack. . .that "sometimes" says something is being ruled by exception rather than ruled by logic, which bugs me, even if I know why it's being done and see the downside of either the "never stack" or "always stack" logical answers. . .YMMV.
i want a character with an origami battle axe
It would be fresh. . .especially when after the battle, you re-fold it into a +20 origami shield.