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What is the difference between a warp shield and a void shield? I know warp shields are on warships and void shields are on titans, but I think I also heard of void shields on warships, so what is the difference between them. I know that warp shields "teleport" stuff into the warp stopping the ship getting hit, but then how do void shields work then?

Gellar Fields protect against The Warp, effectively creating a bubble of reality around the ship. They’re not 100% effective, and the merest flicker can mean baaaaaad things for the crew.

Void Shields shunt energy into The Warp, but can be overloaded. I suspect Warp Shields are the same thing, perhaps just on a larger scale?

Warp shields, also known als geller fields are designed to keep the Warp out of your ships during warp travel.
Void shields on the other hand protect your ship from physical harm, like projectiles etc.
A warp shield does not protect from physical harm, while a void shield does not help against the dangers of the Warp.
Both are used in the big imperial ships.

Gellar Fields (which is what I assume you mean by "warp shields") prevent against daemonic incursion alone. Think of that as the basic hull of a boat keeping the water out.

Void shields are your more typical "force fields", which protect against your standard kinetic and energy damage. This is more like the thick armour plating which you'd reinforce the hull of a boat from.

To complicate things... don't the Raven Guard also have something that inverts a ship's void shield and prevents internal energy leaving it... so creating a stealth field?

One protects from bullets.
The other protects from mind bullets.

TarkinLarson wrote:
To complicate things... don't the Raven Guard also have something that inverts a ship's void shield and prevents internal energy leaving it... so creating a stealth field?

The Heresy Raven Guard had a field that could hide enough of their ship to make it undetectable to Imperial ships as long as they were quiet about it. No idea if they managed to keep the tech though.

Thanks for all your answers.

Don't forget the Warp Fields and Kine Shields that some psykers can generate to protect themselves and others. Then there's Power Fields, most typically used by the Orks but much more widespread in their application in order fluff. These days they're basically what makes most Power Weapons (axes, swords, pointed sticks) so crunchy in combat.