Energy Shield Types?

[YogoZuno]

A question came up recently about the Energy Shield exploit of the Arcanist. What exactly are the energy types an Energy Shield can protect against? Specifically, can it protect against Positive or Negative energy?

For background, spells such as Resist Energy and Protection from Energy list a specific set of energy types you can pick from, which usually just include the common elemental types plus sonic. Pathfinder doesn't have a globally-defined set of energy types, as far as I know. Energy Shield doesn't specify any restrictions - it just say to pick an energy type.

[YogoZuno]

Nobody has any idea?

[Ectar]

It's non-specific, so probably in theory it could resist any type you name.
In a home game I'd probably rule it to be one of the four basic energy types.

[Dark Midian]

Eh, I'd let it protect against the base four and sonic, like resist energy. There are no protections against force spells, and positive and negative energy resistance usually require specialized spells.