Sword of the Planes

This longsword has an enhancement bonus of +1 on the Material Plane, but on any Elemental Plane its enhancement bonus increases to +2 (The +2 enhancement bonus also applied on the Material Plane when the weapon is used against elementals.) It operates as a +3 longsword on the Atral Plane or the Ethereal Plane or when used against opponents native to either of those planes. On any other plane, or against any outsider, it functions as a +4 longsword.