This effect covers a huge area, but the penalty is incredibly harsh, to the point that it’s almost unusable, especially for 26 points. Unless you manage to catch the rare empty ship with it, a single use could shut this dragon down for a major portion of the game.
Losing a turn for each affected ship would be more reasonable, even if that means scaling back the size of the target area slightly.
I would rather not scale back the size of the attack or target area. However I do agree that the penalty is harsh. Suppose it lost a turn for every remaining segment it had?
“This dragon may not be given actions for turns equal to the total number of segments it has remaining.”