1. Only newborn orphans may enter.
2. At age 20 each orphan takes on their destined role.
3. Each role passes on by blood or spirit.
4. Outsiders must never know the truth.
5. From age 10 to 15 orphans attend a normal public school to blend in.
6. Training intensifies at 7.
7. At 12 field missions begin.
8. The headmaster and the 3 caretakers must be formal professionals.
9. No attachment. No escape. No witnesses.