I can love you.

Z - Top tier. Challenging Z-rank will endanger your life. 5 people worldwide S - Challenging S-rank will result in death. 25 usable abilities. 5% worldwide A - Strong abilities. 13 usable abilities. 15% worldwide B - 10 usable abilities. Powerful abilities, but ineffective against ranks above A-rank. 25% worldwide C - 7 usable abilities. 40% worldwide D - 4 usable abilities. 5% worldwide F - No usable abilities. Must live as a slave. 10% worldwide