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How does the Sphinx debuff the set's effect?
Minor spoiler
Doesn't the set add one spectral dragon to your army each day? The Sphinx makes it so that no matter how much the player improves the dragons, they still become skeletal the next day (assuming that the Necromancer dragons are already the weakest in the game).This is a simple attempt to somehow negate this bonus from the dragon set.
Added 8 minutes later
+also, the plot about refugees in the elven lands has been developed, which was ignored in the original.