Kata RPG

First iteration: Characters

A Character should have a name and a health pool.
A Character's health is initialized at 100 and cannot go above this value.
A Character can either be alive or dead - when it reaches 0 health points.
A Character can attack another Character and deal 1 damage point to its enemy's health if it isn't already dead. A Character cannot attack itself...
A Character can heal another Character and return 1 point to its ally's health pool. A Character can heal itself!

A Character can now have a job! Create a jobs package to store them.

A Warrior is a Character that deals between 0 and 9 damage points to its enemy's health! Moreover, a Warrior can attack itself...
A Warrior can only heal itself.

A Mage is a Character that cannot deal any damage.
A Mage can heal another Character and return between 5 and 10 points to its ally's health pool.
From now on, a Character cannot exist without a job.

A Character may now belong to a Faction!

A newly created Character doesn't belong to any Faction.
A Character can join a Faction.
A Character can leave its Faction.
A Character cannot deal damage to another Character of the same Faction.
A Character can only heal another Character of the same Faction.

A Faction may now declare one or more Factions as friends.
A Character cannot deal damage to another Character of the same Faction or of one of its friends.
A Character can only heal another Character of the same Faction or of one of its friends.