Time bombs

Relics of a campaign of purgation and slaughter so dreadful that none but the Wolf King and his innermost circle of priests have been allowed to remember it, save in the lingering echoes of nightmare, these arcane weapons actively breach and damage the flow of time around them when they detonate. Merely being in proximity to the blast radius of these terrifying weapons is as perilous as any rad grenade as a sudden time distortion freezes the target, but far from consistently, an effect that can leave its victim frozen out of phase with existence, a trapped echo lost in the void, or shattered like a statue of ice. It can just as easily result in withered flesh and failing organs for the wielder as their own lifeforce is drained away in years and decades from a failing stasis field. Such a fate for the Deathsworn however, seems oflittle concern

Horus Heresy Book 7: Inferno