Void shields

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Void Shields are the most ubiquitous 40k energy shield. They are comparatively huge to other Imperial shields, so they are only mounted on vehicles, and the big ones at that. Classic void shields were pretty puny, and made up for it by being layered one under another so you had to take them all out to hit the thing they were guarding. "Modern" ones are more beefy, can actually take a hit, and usually come in sets of 1-3. However, these "single shields" are actually arrays of smaller shields overlapping, much like the older fluff, and are best described in the novel Titanicus by Dan Abnett.

Void Shields displace missiles and projectiles by placing them into another dimension, which is why missiles go *Poof* when they touch them. The Imperium, being the Imperium, has also found a way to weaponise the damn things. Get a ship with void shields close enough to another ship, or a space station, or a planet or what have you and then turn those suckers on. Bam. Suddenly, your enemy's missing half of his shit and you didn't even have to fire a single gun.

Void shields used to suck in Epic, since absolutely any hit would take one down; they were basically your "that hit didn't count" hits before taking any body damage. Titan Legions altered this so that the attacker had to have at least a -1 saving throw modifier (ie, be at least a Lascannon), ending the spectacle of a bunch of infantry advancing on a Titan to fire a billion attack dices' worth of bolters at it before anyone actually fired any good weapons.