[RPM] buffing weapons to do damage for a duration

[PK]

Note that, per the usual GURPS rules, it's a special effect to change every +2 to damage into +1/die. That is, if your weapon does 5d+2 damage, and you pay for "a +4 damage bonus," it's legit to interpret that as "a +2/die damage bonus" and call it a net 5d+12.

As for weapon weight, I'd say that yes you do, because I can't picture a spell that increases damage done that doesn't effect a physical change in the weapon. Even just "it swings faster and hits harder" is a physical change. (And trying to get around that by saying something like, "It has a mystical field that causes instant necrosis in the wound, inflicting more damage," is just an argument for paying for the weight of your victim instead!)

BTW, it's worth mentioning that several people here have argued that Bestows a Bonus/Penalty should "flatten out" rather than continue to double, and while I don't plan on retroactively changing the existing mechanic, I do support this as an optional rule -- one that I'm planning to work into a future supplement (as an official optional rule). Basically, at +/-3 or higher, use a flat 4*(D-2) for Narrow, 8*(D-2) for Moderate, and 20*(D-2) for Broad, where "D" is the degree of bonus or penalty.