Deities and Demi-gods
Potency is the power trait that rates the general power of Gods as between themselves. An ogre and a young god might both have a d8 strength, but the Potency of the God is going to be a huge leg up in any battle between them.
Potency also comes with some free SFX:
sfx – Resistant – step up and double Potency die in any dice pool to resist mental or magical attacks.
sfx – Invulnerability – spend 1 PP to ignore physical stress except that caused by [TYPE]
[TYPE] equals Sovereign Metals plus possible additional materials as per Potency rating below.
sfx – Empower – shut down your Potency Die to step up or double another power die, Recover on your next action where you do not use empower.