Answer:
He has one and a person has two. A citizen has three. And a human being has four. A personality has five. And an inhabitant of earth has six.
It can pierce the best armor and make swords crumble with a rub, yet for all its power It can't harm a wooden club.
Soldiers line up spaced with pride. Two long rows lined side by side. One sole unit can decide, if the rows will unite or divide.
Put into a pit, locked beneath a grate, guarded through the night, yet it still goes out.
Has feathers but can't fly. Rests on legs but can't walk.
What is always coming but never arrives?