House Varlock was presumably founded during the Dark Age of Technology, like other Knight Houses. In the latter years of M41, the world of Cyprus Ultra came under attack by the vile Ork Warboss Gorgutz 'Ead 'Unter and his Orcs. Though Imperial units waited in orbit, Inquisitor Holt forbade any deployment. Chapter Master Gabriel Angelos of the Blood Ravens, ignored this order however, and deployed from the Battle Barge Dauntless to assist the staunch defenders of House Varlock in battle.
- Defence of Cyprus Ultra (Unknown Date.M41) - House Varlock, with help of the Blood Ravens, defended their home world against an Ork invasion.
- Drakaina - Drakaina is the personal Knight Crusader of Lady Solaria, the head of House Varlock. She brought her foreboding Imperial Knight to support the forces of the Blood Ravens, unleashing a devastating barrage of unrelenting fire from her twin Avenger Gatling Cannons and Ironstorm Missiles, becoming the terror of all who would dare stand against the Space Marines.
- Lady Solaria - Solaria sits at the head of House Varlock. Fierce and stubborn, she is an invaluable ally in the heat of battle, or a devastating enemy. Recently, she fought alongside the Blood Ravens Chapter in the defence of her homeworld of Cyprus Ultra.
The colours of House Varlock are blue and white with golden trim.
House Varlock's crest is the head of a golden sea-serpent centred upon a blue circlet, framed by an ancient, gold compass symbol.