Vayshan
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No, I think the opposite: since the Sylvan faction now has such powerful abilities, I would upgrade anti-chaos, just to be on the safe side. It's a useful thing to have, and there's even a skill that increases the enemy hero's mana cost by 50%. And here, there are three of them! Can you imagine how much mana that would cost? So, you won't be able to use Earth Shocks or Meteor Showers very often...