Dragon-Slaying Strike (Su)
Replaces: Holy Champion
At 20th level, an oathbound paladin becomes a conduit of holy power. Her DR increases to 10/evil. Whenever she uses smite evil and successfully strikes a dragon, the dragon is also subject to a single-target holy word, using her paladin level as the caster level. After the banishment effect and the damage from the attack are resolved, the smite immediately ends. In addition, whenever she channels positive energy or uses lay on hands to heal a creature, she heals the maximum possible amount. This ability replaces holy champion.