Richard has the ability to cast miracles and other divine magics, his main issue is that he not yet mastered how to regulate his mana consumption. Also, even if he has a minor form of regeneration, catastrophic damage done to his body will still kill him. (e.g. Falling into a volcano, High yield explosions that blow his body to smithereens, etc.)

Astra is extremely strong and durable. Her weakness lies in her below average agility and tends to take things literally. Her lack of understanding of emotions hinder her from empathizing and connecting with others and her mana core may sustain her easily for a week, but if used often to enhance her functions; Astra's core can only sustain her for 3 days at best and a day at least.