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 applies on the Material Plane when the weapon is used against elementals.) It operates as a +3 longswordon the Astral 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.

Strong evocation*;*CL 15th; Craft Magic Arms and Armor, *plane shift;*Price 22,315 gp; Cost 11,157 gp and 5 sp + 893 XP.