Gnoblars are small greenskins that evolved to their current state when Ogres moved from the mountains of the Giants to the Mountains of Mourn and kept them as pets/rations.
Gnoblars have the place of being the singularly most mistreated beings in either Warhammer setting, as Ogres see them somewhere between vermin-like insects that are simply a fact of life to deal with, or very low and undepletable slaves. Sometimes as food if there's nothing better around, although some Gnoblars wind up in the position of "favorite hunting dog" as long as the Ogre can remember them. Meanwhile, Gnoblars see Ogres as a mix of living gods and eternal masters. They differ from Goblins in that they are much smaller and dumber, and while Goblins have pronounced noses the face of a Gnoblar is mostly nose. This gives them a beaky appearance, making them resemble a Jim Henson Muppet character.
Gnoblars who are favored by an Ogre have their ear bitten off, and assume the rank among Gnoblars that their master has among Ogres. They are extremely hierarchical, and come in the following ranks:
- Lords Equivalent to a Tyrant. Supreme masters of the Gnoblars. Paranoid as hell, immediately order Woodbellies to kill any Gnoblar they see as a threat.
- Tooth-Gnoblars Servants to Butchers or Slaughtermasters, the priesthood of Ogres. Although high-ranking, they suffer among the most of any Gnoblar as they are tasked with gathering chunks of meat, and often end up so covered in blood they are indistinguishable as anything more than jiggling fat to their masters.
- Trappers Servants to the Ogres who gather food for their race. Well-respected, although often used as bait.
- Manbiters Gnoblars who serve Maneaters, and travel the world with their master. They recount the tales of their master to other Gnoblars which sometimes reaches the ears of other Ogres. Gnoblar Manbiters aren't above serving other races as mercenaries independent of their Ogre either, and are the most common greenskin to be found working alongside non-greenskins (although its worth noting Gnoblars are fairly more bungling and annoying to any civilized race than useful).
- Torch Gnoblars Leadbelcher servants. Used to light cannons for their masters, and have suffered from burns, soot-blackened skin, and blindness as a result. Trying to paint your models like these may be...awkward in some company...
- Woodbellies Irongut Gnoblars. Serve as the enforcers for the Gnoblar Lord in the same way their masters are enforcers for the Tyrant. Are somewhat independent as far as Gnoblars go.
- Bullies Ogre Bull servants. Their rank in Gnoblar society is purely based on their size alone, and they act like their masters do other Ogres towards any Gnoblar smaller than themselves.
- Fighters The most basic Gnoblars who have any sort of respect from any sort of Ogre. Since they're unwilling to do grunt work as they can claim they're better than that, they mostly just wait for fights in which they will join on behalf of the Ogres.
- Scum The dumbest, weakest, smallest Gnoblar. Also any Gnoblar of superior quality who hasn't had an Ogre dote on them. Scum do not participate in battles and just do the work of the Ogres from gathering simple food like insects, leftovers on the ground or stuck in fat folds/clothing for other meals, and other assorted basic tasks. They're fairly useless at anything complex, and as a result rarely do anything important enough for an Ogre to take notice and bite their ear because otherwise they wouldn't be Scum still.
Gnoblar don't properly exist in 40k, although it can be fairly said that Gretchin, the 40k equivalent of Goblins, are much more like Gnoblar than they actually are Goblins and serve Orks in the same way that Gnoblar serve Ogres.
On The Tabletop
Gnoblar Fighters are the basic form of Gnoblar. They're simple Tarpit models that fulfill the roles of flank protection, flank chargers, or basic tarpit. They cost a mere 2.5 points per model, making them the second cheapest in the game (and the only one to use a decimal for point cost). They also cause absolutely no Panic tests for being broken, making them the ideal throwaway Unit.
Even better, for 25 points a Unit can be upgraded to Trappers which cause Dangerous Terrain tests to enemies that charge them which is a splendid defense against horde formation enemies.
While not an absolute must, Ogre players still favor their little Gnoblars in most lists.