Do clerics spend Fatigue to power their spells? Can they use powerstones?
Clerics spend fatigue as do mages. The rules for reduction of fatigue cost for high levels of skill do apply to clerics. Local mana level does not affect their casting at all, but places sacred to their god act as High or Very High Mana areas for them, with the resulting reduction in Fatigue cost. But, with the exception of the clerics of Fermus, they cannot use powerstones. However, it is possible to petition the god on the spur of the moment to grant power to cast a spell that the cleric is too weak to otherwise cast; this is done with an IQ + Power Investiture roll, which is actually a Quick Contest with something I won’t describe, just to keep it mysterious…