[Juzza]

Thanks for the input I'm aware dt_magic only does x2 vs magical I don't need a lecture on basic modding.

secondaryeffect doesn't work like that,

"This secondary effect will affect anyone harmed
by the weapon. See Table 7 for some effects.
The effects are actually also weapons and share
the same numbers as all other weapons."

And no, the shapechanging works fine because it's reliant on the monster number and the name. If the description didn't change neither would anything else as it changes the creature to an entirely different creature.