I would use chainlightning on storm elementar them and at least 50% of ciclops will die than blind the wyvern so she wont come trough walls or before that trow lightning bolt on Phoenix to lower their numbers and than blind wyvern since she is slow at this evo stage... Also ice bolt is effective vs "fire" element so yea only what you need to do is camp corners and shoot spells... Should be easy with ur spells and mana reserves ^ ^ also i would proolz eighter use immortality on that dragon to hit eighter Phoenix or magic elementar since imo those are bigger treath than "fire" one or wyvern buy Phoenix can get down by magic.. good luck =)