Blue Wyvern (Ar tonelico: Melody of Elemia)

The second strongest wyvern sub-type enemy, and third strongest among the Dragon-type monsters, these creatures can Paralyze with their normal attack, and their Tornado attack can delay the turns of all your vanguards in addition to causing large damage. Make sure to take care with the paralysis, and try to keep healed in case you get delayed too much.