Neither Elf nor Human

You have removed yourself from your heritage so thoroughly that even magic does not recognize you.

Prerequisite: Exile’s Path, Seen and Unseen, character level 11th, half-elf.

Benefit: You are not considered elven or human for the purpose of harmful spells or effects based on your type, like a bane weapon or a ranger’s favored enemy class feature.

Source: Advanced Race Guide