We're playing Hot Seat;)
The probability of seeing a Fist in the Elven guild is 20%. (3 first-level Dark spells and 2 summons in one slot, because in the other two, Chaos and Light are guaranteed). I wouldn't say it's small, but it's not a percentage you can rely on. However, we're talking about the late game, and there will likely be a lot of secondary skills. The chance of finding a spell increases sharply :)
Bow down and hear our cry,
Our earthly rulers falter,
Our people drift and die,
The walls of gold entomb us,
The swords of scorn divide,
Take not thy thunder from us,
Take away our pride.
G.K. Chesterton: English Hymnal