Second changeling castes

Burrower: This caste is a little smaller then a normal drone. Their body is more compact, similar to a mole. Their hooves are stretched into sharper appendages, enabling them to slice through any material. Their heads are more angled and pointed then other changelings. They lack horns and wings, since that would get in their way while digging, so they can't use magic or fly. They also have no tail, visible ears (instead a hole like reptiles and such), or fin like protrusions like other changelings.
They also can spit acid which can quickly corrode and substance. (Flesh and steel as examples.)

Hunters: Similar in build to cats, these creatures are twice the size of timberwolves. They are long and lithe, able to outrun any creature they come across without tiring.
Their hooves are split into two long dagger like claws, which are to slice and skewer prey. They have long tails with a large blade at the end, which they use like a whip, in order to kill or maim their prey.
As well with most other specialized castes, it cannot change. Instead, it has the ability to make itself invisible. Since the Hunter class give off no heat signature or scent, they cannot be detected by those ways. As with their silent attack, you won't hear them until they strike.
This caste was created to hunt down prey for the hive, since changelings are a mostly carnivorous species.

Workers: Similar to drones, this caste is used to make silk, which they create in their mouths. They have mandibles on the side of their mouths which help them do this. They also create a composite substance that is used to make the structures of the changeling nests. (This is why they have extended bellies.) Due to this added weight, their four wings (like those of a dragonfly) are larger and stronger than a drone of the same size, since they also have to carry objects many times their weight into the sky.
They are also not as bright as regular drones, being easily tricked and such. (Which one would think strange in a race that survives on trickery.) This is mostly due to their contented lifestyles and that they don't need to change like the drones do.

Scout: These are the changelings from the show. I view them more as infiltrators. They are expert infiltrators and spies, able to absorb mountains of information and still process at full efficiency. They can drain a target of its memories and pose as an exact copy with nary a problem. With their massive changing ability, they can become nearly anything up to a creature a little over their own size. (As well as manipulate their own limbs into swords and such weapons.)

-Evo