"They Shall Know No Fear": The loyalist Fallen still swear allegiance to the Emperor and their unfaltering faith in him lets them benefit from the "They Shall Know No Fear" rule.  See Codex: Space Marines.

THE SCRIPT OF THE FALLEN

LOYALIST FALLEN ANGELS SPECIAL RULES The Script of the Fallen uses a combination of standard official rules and unique rules developed by the Fallen Angel Steve Byles. Where the standard rules are appropriate they have been included while new rules have been added or additions made to standard official rules to maintain the army's core rules in line with the spirit of its background. These rules are supplementary to those described in the Codex: Spacemarines, Codex: Dark Angels and Codex Chaos Space Marines.

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Fallen Angels Armoury: A Loyalist Fallen Angels army may use any wargear and weapons from the Script of the Fallen. However they may not be given any gifts or powers that are from the Chaos gods.

Disgust of the Abomination: At heart the loyalist Fallen are still Dark Angels and will refuse to fight alongside any kind of Daemons, sorcerers and non-humans unless you are playing a special scenario as they feel such things are heretic and an insult to mankind.

Hatred: The Fallen hate all loyal Dark Angels more than anyone else due to their failure to see the betrayal by El'Jonson and the fact that they loyal Space Marines are hunted like animals hence the less hunters the higher chance of their survival.  Any Dark Angel Squad killed by a Fallen Angel earns D6x10 VP.

Daemons and Chaos Gifts: Due to the Fallen Angels failure in the eyes of Chaos they may not take any chaos gifts including daemonic vehicle upgrades or use daemons in any form.

Experienced Veterans: A Fallen Lord can have up to 150 points of wargear (If Chaos only 100 points worth may be Daemonic Gifts) Fallen Lieutenants, Commanders and Sergeants member may have 75 points of wargear (If Chaos only 50 points worth of this may be Daemonic Gifts) Normal Fallen may have up to 25 points worth in total of Wargear and/or Veteran Skills(Every member in a squad must have the same veteran skill) (If Chaos Daemonic Gifts maybe purchased) Models armed with heavy/special weapons may not take wargear or extra weapons as they are too preoccupied with their own particular heavy weapon.

Limited Resources: Due to the limited resources of the Fallen there are many limitations on the number of troops available to the Fallen.  Also you may only take 3 vehicle upgrades per vehicle from Codex Chaos but not daemonic gifts.

Aura of Doubt: Seeing Dark Angels fighting each other is confusing site especially for Dark Angels not supported by a more senior member to help them in their moment of doubt.  Fighting a fellow Dark Angel is quite a confusing test.  Hence if a loyal Dark Angel is within 12" but is not accompanied by a member of the Deathwing they suffer -1 to their leadership as their former brethren implant seeds of doubt in their heads.