Grand Helm

Hi everybody,

last saturday we (that is me and my group of players) had another
game of spelljammer and naturally the Quad mages appeared (I
mentioned they are important in my campaign).
Well, I remembered what was bugging me about their ship, the Quad of
Thay: The Card states that the ship is powered by a "Grand Helm", but
in the rules of the Spelljammer Box there is no indication what a
grand helm is.
I ruled that they just use a major helm and another device, which can
be activated to cast spells while sitting at the helm. However the
device lowers the SR by 2.

Still I am not content with this and so I would like to know if
anyone has an idea what exactly that "Grand Helm" is?

With regards,

Kai


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