I'm trying to figure out how to create/cost out enchanting a weapon such that it can penetrate any DR but untyped (i.e. equivalent of +5 enchantment bonus, capable of overcoming DR/magic,cold iron,adamantine,alignment), but also that has zero or at least minimal bonuses.
For example, enchanting a weapon to +5 adds 50,000 gp, but you not only get the ability to pierce DR, you are also getting the +5 hit/damage. I'm curious what the relative weight of the DR penetration vs the hit/damage bonuses are in that mix and what, if any, spells could be used to generate that weapon.
Thoughts?