Sheer Determination

Sheer Determination is the fifth skill in 's Spirit skill branch. It gives him +15% when his HP is half or lower.

Overview
Taking less damage at lower HP means that the party can afford to take a bit more time before attending to Reyn. It's not enough of an effect for just leaving Reyn at lower health so he takes less damage to be a good long-term strategy, but it can work in the short-term. It's surprisingly cheap to link, though most other characters won't have as much physical defence for the percentage-based boost to work with.