Faith
Erin's choice of hero moniker aptly describes the fuel for her powers. For Erin, faith isn't proselytizing to non-believers, paying lip service only to her God. For Erin, her faith means showing those around her the power of her God through her acts and deeds, without advertising to others who or what she is about (unless asked), and fully trusting that her God will pull through for her in the end. When she is full of faith and conviction, her attacks become more powerful and her healing abilities are more potent. When that faith wavers, so do her powers. Should something occur that truly causes her to question her faith in God, it could very well strip her of her powers.
Divine Healing
Erin has been granted the power to heal the sick and injured. She needs to be within 10 feet of her target, though she often prefers to be in much closer proximity when using this power. For minor injuries and afflictions, she does not require much focus. For major injuries, especially those that are critical or potentially fatal, she needs to have complete focus, with no interruptions. She is able to cast out her healing powers in a sphere around her, but the effect is not as powerful as when she focuses on one specific target, therefore making it not an ideal solution when there severe wounds to see to.
Celestial Blasts
Erin is able to gather up divine celestial power and use it offensively to fire off projectile blasts. She can do this either with hand gestures, or through channeling the power through Gratia, her sword. It can also be used as a source of illumination. The blast is a blinding bright. This power's effectiveness depends on what the target is. Against your average human or metahuman with a normal resistance to attacks, it's pretty effective. If the target is resistant to damage, not so much. However, if the target something evil and supernatural, it's devastating.
Holy Purification
Think of this power as an evil, supernatural entity repellent. Erin can cast this in a sphere around herself, at a radius of roughly 10 feet, and keep such creatures at bay. It is painful for evil creatures to come into contact with, deadly to the weaker variety (such as fledgling vampires or zombies), and usually is enough to keep them off of her for a short time.
Multilingual
Erin is pretty well traveled, having spent a significant amount of her young life living in foreign countries, and as a result she has learned other languages. She is fluent in Tagalog, Filipino, English, and Indonesian. She is also proficient in Sinhalese and Tamil.