As an empyreal knight advances, her ties with the celestial realms grant her a portion of the abilities and defenses of true angels. At 3rd level, she gains resistance 5 against acid, cold, and electricity. At 6th level, she gains a +4 racial bonus on saves against poison. At 9th level, her defenses improve to resistance 10 against acid, cold, and electricity. At 12th level, she gains immunity to petrification.
At 15th level, she gains truespeech, the ability to speak with any creature that has a language as though using a tongues spell. This ability functions with a caster level equal to her character level, and is always active.
At 18th level, as a swift action, the empyreal knight can manifest a protective aura against evil. Against abilities or effects created by evil creatures, this ability provides a +4 deflection bonus to AC and a +4 resistance bonus on saving throws to anyone within 20 feet of her. It otherwise functions as a magic circle against evil. She can use this ability for a maximum of 1 round per day per paladin level. These rounds do not need to be consecutive. These abilities replace mercy.