Doom Sentinels

The Doom Sentinels are a Loyalist Adeptus Astartes chapter founded during the 21st Founding, also known as the Cursed Founding. Known for their ruthlessness and determination, the Doom Sentinels have garnered a reputation of being absolutely merciless towards their enemies, or protecting the people of the Imperium. What information about their origins were lost during the 7th Black Crusade, also known as the Ghost War when their homeworld, Quicksilver II was attacked by the Black Legion, though the world itself survived. Along with being one of the few loyalist chapters to still used Chainaxes, the Doom Sentinels are noted to have enhanced strength surpassing what Space Marines are supposed to have, as greater durability. This mutation has been greatly used by the Doom Sentinels due to their chosen fighting style.

Notabale Campaigns

 * 7th Black Crusade:


 * 13th Black Crusade: During Abaddon's most recent crusade, Quicksilver II was attacked by a combine force of both Black Legion and World Eater marines. The Doom Sentinels and Planetary Defense Force waged a ten month long defense against the attacks, suffering heavy losses. By the time reinforcements arrived, the Doom Sentinels were reduced to only 100 men strong. Fortunately with the return of Primarch Roboute Guilliman, who was now the Lord Commander of the Imperium, sent the heavily depleted chapter reinforcements in the form of the Primaris Space Marines. Soon the survivors also became Primaris Space Marines.

Geneseed
The geneseed of the chapter Doom Sentinels is mutated in certain degrees. Specifically the Biscopea, which is what gives a Space Marine enhanced physical combat ability and survivability. To be precise, a Doom Sentinel's strength is the same as a Space Marine wearing Terminator Armor, with their durability being enough to withstand a strike from a power weapon. This has made them formidable against opponents who normally possess strength greater than a normal Space Marine. The trait has also made the chapter a point of interest to the Adeptus Mechanicus, hoping to learn more of how this came to be. This trait was passed on to the Primaris Space Marines who were inducted into the chapter. It was further enhanced by Sinew Coils unique only to the Primaris Space Marine.