Ter Adun has the cards to deal with a t5 Raven t6 Aeon. As such, if you think it is a big issue, then it must be because is ability doesn't directly allow you to control the board. As such, any hero that didn't have an ability that directly allows board control would have the same weakness against t5 Raven t6 Aeon. Namely, the Priests, Elementalis, and some of the weapon based heroes (such as Serena, who should nearly always attack the hero with her ability).
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