Saint Celestine

All friendly models that are within 12" of the Warlord use the Warlord's Leadership value when taking Act of Faith or War Hymns Leadership tests, unless their own is higher.

A unit that contains at least one model with this special rule that is locked in combat can choose to leave close combat at the end of any Assault phase. If the unit wishes to do so, it must take an Initiative test.

If the test is failed, nothing happens and the models remain locked in the fight.

If the test is passed, choose a direction - then roll 3D6. As long as the distance rolled, in inches, is sufficient to allow the entire unit to move over 1" away from all of the enemy units they are locked in combat with, the unit breaks away from combat and must immediately move a number of inches in the chosen direction equal to the 3D6 result, ignoring the models they were locked in combat with. No Sweeping Advance rolls are made. Enemy units that are no longer locked in combat immediately Consolidate D6".

A Hit & Run move is not slowed by difficult terrain, but takes Dangerous Terrain tests as normal. It may not be used to move into base or hull contact with enemy units, and models instead stop 1" away. If there are units with this rule on both sides who wish to disengage, roll-off to determine who goes first and then alternate disengaging them. If the last of these ends up no longer in combat, it Consolidates instead.

Models with the Shield of Faith special rule have a 6+ invulnerable save and the Adamantium Will special rule.

If a model with the Martyrdom special rule is your Warlord, and that model is removed as a casualty during the battle, all friendly units wholly comprised of models with the Act of Faith special rule automatically pass all Leadership tests until the end of your next turn.

Independent characters can join other units.  They cannot, however, join units that contain vehicles or Monstrous Creatures.  They can join other Independent Characters, though, to form a powerful multi-character unit!  Independent Characters pass Look Out, Sir rolls on a 2+. A unit that contains one or more Independent Characters does not need a double 1 to Regroup if reduced to below 25% of its starting numbres, but instead tests as if it had at least 25% remaining.

Full details in BRB. Rule too long to copy verbatim.

Units containing one or more models with the Fearless special rule automatically pass Pinning, Fear, Regroup tests and Morale checks, but cannot Go to Ground and cannot choose to fail a Morale check due to the Our Weapons Are Useless rule. If a unit has Gone to Ground and then gains the Fearless special rule, all the effects of Go to Ground are immediately cancelled.

A unit with the Act of Faith special rule can attempt to use its Act of Faith immediately before it acts during a phase; i.e. immediately before the unit moves in the Movement phase, shoots (or runs) in the Shooting phase, or before any blows are stuck (either by friend or foe) in the Assault phase. To do so the unit must take a Leadership test. 

If the test is failed, nothing happens and that unit cannot attempt to use that Act of Faith again for the rest of the battle. If the test is passed, the Act of Faith is successful; unless stated otherwise, all models in the unit will immediately gain a special rule until the end of the current phase. The special rule gained will be listed in that unit's Act of Faith entry, along with which phase(s) the Act of Faith can be attempted in.

Unless stated otherwise, a unit can only attempt to use an Act of Faith once per game and a unit cannot attempt to use more than one Act of Faith in the same phase. A unit can only attempt to use an Act of Faith if it is entirely comprised of models with either the Act of Faith or War Hymns special rules.