Silver Skulls

Chapter's origins are lost to antiquity, but it's quite possible, that it was founded because of strategic prognostication
Silver Skulls are said to be among the most renowned and honored chapters of the Second Founding's ranks
Chapter's progenitors are Ultramarines
Their gene-seed is of a new generation

Codex Demeanor: Victory, no matter the odds
Gene-Seed has no Deficiencies
Chapter has no flaws except extreme superstitiousness
Characteristic Modifiers: +5 to two characteristics of the player’s choice
Founding Fathers: Chief Prognosticator Vashiro
Homeworld: Feral World of Varsavia
Predominant Terrain: Temperate
Relationship with Home World: Distant Rule
Organization: Divergent Chapter (they possess specialist rank known as a "Prognosticator")

Combat Doctrine

The Silver Skulls have a reputation for being fierce fighters, warriors who acquitted themselves on the field of battle with an almost legendary savagery. They preferred to deploy more as skirmishers than line troops, unleashing their strength where it would make the most difference when fighting alongside other Imperial military forces. Their refusal to give ground during combat was a defining trait of the Chapter.

Solo Mode Ability 

This Chapter has been trained to spot minute disturbances of the warp pressing in on realspace. This attunement to the empyrean grants the character the Psyniscience Skill as a Trained Skill. The Battle-Brother may also re-roll any failed Willpower Tests to resist a psychic power.

Speciality Restriction: none

Squad Mode Attack Patterns - Storm of Hell 

Action: Full Action, Cost: 3, Sustained: Yes. While this ability is in effect, The Battle-Brother and those within Support Range of him gain the Furious Assault Talent and the Frenzy Talent. At Rank 4, activating this ability is a Half Action.

Squad Mode Defensive Stances - Rally Cry (as Ultramarines) 

When a Battle-Brother uses this ability, it instantly restores a number of

Cohesion equal to his Fellowship Bonus. The reverence the Ultramarines hold for their Primarch and the strength of will required to make a Rally Cry is such that a Battle-Brother may only use this ability once per game session.
Special Equipment: Imperial Tarot
Beliefs: Varsavian Orthodoxy
Chapter Status: Nominal
Chapter Friends: Adepta Sororita
Chapter Enemies: Red Corsairs
Battle Cry: "Primus Inter Pares!"
Custom Chapter Advance Tables: No Respite to the Enemy

Источники

http://warhammer40k.wikia.com/wiki/Silver_Skulls
http://wh40k.lexicanum.com/wiki/Silver_Skulls