I may have found a typo in Player Core. Under the Sustain an Effect exploration activity on page 439, it says "Sustaining an effect that requires making complex decisions, such as spectral weapon, can make you fatigued, as determined by the GM."
I couldn't find any other reference to "spectral weapon". Perhaps this was intended to be the "Spiritual Armament" spell?
(Sorry if this is the wrong place to post this.)
