Your insight into the tactics and abilities of dragons grants you awareness of how best to avoid their magical attacks.
Prerequisites: Wis 13, Dragon Hunter.
Benefit: You gain the evasion ability against the breath weapons of dragons. (If a dragon’s breath weapon allows a Reflex save for half damage, a successful save indicates that you take no damage.)
Also, you gain a bonus equal to half your character level on all saving throws you make against the supernatural or spell-like abilities of dragons.
Source: Draconomicon, page 104.