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While I fought and Zack was entertaining the Wyvern King, I took a quick glance at the rest of our party and how they were handling things. Aquarina was doing really well on her own, she was pretty much letting the Wyverns bite, sting, and slash at her with their claws, taking no damage at all.
There were different ways of body reinforcement out there, although we all had the same Tier 6 Physique, the way everyone grows their Physiques is different. And there's also Stats that come into play for System Users.
While my Physique's development specialized on speed, dexterity, attack speed, and strong physical strength, while I didn't specialize much on defenses, Aquarina went for a more all-rounded, yet much more tanky build, increasing her speed and stealth at the beginning, and at the latest stages cultivating her toughness to extreme levels, alongside potent attack.