Feverlings

 Sorcery is an imposition of the imagination onto reality. When the imagination is warped by mind-altering states, those with sorcerous gifts are particularly dangerous and unpredictable. Feverlings are occasional by-products of failed invocations and the accidental probings of the unconscious while the sorcerer is suffering from fever. They are physical manifestations of fever-dreams, creations of chaotic energy.

Painting by Jody Siegel of one of his Shrikes

 Also known as "Sorcerers' Children", feverlings are compelled to serve the being from whose mind they have sprung. Some sorcerers will deliberately ingest substances to induce a fever-state and call into being these servants, but this process is dangerous and easily results in a more calamitous failure. Feral broods of feverlings are frequent hazards when exploring realms once inhabited by sorcerers.
Feverlings mature from their awkward larval form within a year, becoming lesser feverlings (stats of a goblin) and after anywhere from five years to a decade they become tougher and smarter elder feverlings (stats of an orc). They will have scavenged proper arms and armor by that point, but lesser feverlings are often stuck with slimmer pickings, such as damaged weapons or re-purposed farm implements.
A sorcerer's brood will have major characteristics in common, but each clutch has its own variations in form. Optionally, each individual has certain features setting them apart, but in practicality it will often not be worth recording on the individual level, so you could just apply those features to the clutch instead.

with clutches and feverlings in each clutch.

Tables in case you'd rather roll your own:



The brood of a sorcerer will be bipedal and have the features of -

1	Bats	5	Boars	9	Badgers	13	Macaws	17	Great Horned Owls
2	Goats	6	Sheep	10	Hyenas	14	Crows	18	Bearded Vultures
3	Bears	7	Rats	11	Shrikes	15	Blackbirds	19	Harpy Eagles
4	Panthers	8	Shrews	12	Hawks	16	Cranes	20	Barn Owls

And be borne of a fever-dream of -
1-3  Wrath (recklessly seek to harm others)
4-5  Terror (avoid outright conflict, but eliminate threats if able)
6-7  Hysteria (unpredictable behavior)
8      Despair (withdrawn, enervated)

A clutch of feverlings will have the horns of a -

1	Bighorn Sheep	5	Markhor	9	Saiga
2	Addax	6	Water Buffalo	10	Mouflon
3	Oryx	7	Kudu Antelope	11	Pronghorn Antelope
4	Elk	8	Chital	12	Nubian Ibex

And coloration of -                         Colors -

1-3	Solid Coloration	1	Charcoal	5	Umber	9	Amber
4-5	Spotted (2 colors)	2	Blue-black	6	Green-black	10	Ashen
6-7	Striped (2 colors)	3	Moss	7	Crimson	11	Rust
8	Albino	4	Bone	8	Cream	12	Kelp

And will have the following behavior -

1	Greedy	5	Utterly silent
2	Cruel	6	Territorial
3	Ever-hungry	7	Stalking
4	Constantly whispering	8	Giggling

An individual feverling will have -

1	A tail	5	A long beard	9	Long ears
2	A bristly mane	6	Glowing Eyes	10	An extra eye
3	A bristly beard	7	Smoking breath	11	No eyes
4	A long mane	8	Steaming skin	12	Long tongue

And -

1	Mites	5	Blisters	9	White eyes
2	Fleas	6	Patchy fur/feathers	10	Has a strong odor
3	Scabs	7	Raw skin	11	Constantly sheds
4	Sores	8	A disease	12	Drooping skin