So I just picked up the Sword of the Planes last night in our CoT campaign. My GM says it only works as a +1 on native outsiders because 'they are from the material plane', I think it should be a +4 because that's how it works against outsiders and the rules for it say nothing about it being any different for outsiders from the material plane.
I'm I just blinded by my need to pump out more damage, or is this how the sword actually works?