Stormwaker Y-700 Head, Haste II and Automaton AI.

[Balloon]

Out of curiosity, I changed to DRG, equipped Upukirex and ran outside for /checkparam. My wyvern has 733 defense, which is a tad more than Balloon's example.

Which is without any parameter boosting, try Wyvern Def * (960/CurrentWyvernAttack). Then add the bonus from Protect/Shell from Spirit Link. That's how high you can probably expect it to get.

Ignoring that though, I mean.. slowclap. 3 more def than us and still getting a def boost. Bravo.