By 3067 the clans in the Inner Sphere have all but abandoned the clans' ritualized form of warfare know as Zellbrigen. However, they do on occasion use Zellbrigen combat in Trials vs. each other. Of a player is using the Trial of Possession operation it is required that player follow the rules of Zellbrigen. A Mech violating the rules on a given turn must be ejected on the following movement phase.
The Rules of Zellbrigen used in this campaign are as follows:
- A Warrior will never fire on a Mech already engaged with another opponent.
- A Warrior will never engage in physical attacks, unless he has no other forward firing weapons at his disposal.
- A Warrior will never fire on an unconscious pilot, unless the pilot has either refused hegira, or intentionally caused their disability. Examples of this are attempting to stand with a damaged or destroyed gyro.
- A Warrior will never target the Head of a Mech or Call High Shots. Use of Called Shots or Targeting Computers against other parts of a Mech is always acceptable.
- A Warrior will never willingly flee the field while engaged in a duel.
- A Warrior may break LOS during a duel, but must make every effort to return to the LOS during the next movement phase. This does not mean he must commit suicide though. Moving into the rear arc is never considered breaking LOS.
- A Warrior may move out of long range of his weapons, but must make every effort to return to long range during the next movement phase.
- A Warrior will never intentionally interfere with another zellbrigen duel. This includes blocking movement of another unit.
- A Warrior may ask for hegira if he meets any of the requirements listed below, but his opponent is under no obligation to grant it.
- A Warrior may offer hegira to a disabled foe. A disabled foe is one that meets one or more of the following criteria. If a Warrior refuses hegira, he may be fired upon.
* Missing Leg
* Two Sensor Hits
* Two Gyro Hits
* No Weapon
* Pilot has taken 4+ Hits, and is Unconscious
- A Warrior may ask for hegira or be granted it at any other time, but must eject the unit in question if it does not meet the above requirements.
- A Warrior will never attempt to clear or ignite a hex that is occupied by a unit that it is not in a duel against.
- A Warrior will never deliberately move in a way that would block a unit that they are not dueling. Deliberate is defined as taking a inferior move in terms of range, movement mods, and or firing arcs to block an opposing unit.
- A Warrior will never fire on a hegira unit.
- A Warrior will never fire on any duel eligible unit other than the current opponent.
- A Warrior will never place the rear side of a Mech against the map edge at the end of any phase other than deployment.
- A Warrior will never deliberately place an opposing unit in the radius of ECM or Active Probes that they are not dueling. Incidental exposure of ECM/Active Probes relating from a sound, tactical move during their own duel are exempt from this rule.
- A Warrior will never use a spotter or spot for another unit using indirect LRM fire.