Little Birds

Along the Western edges of the Barony, inside the Forest of Worms, live a people culturally distinct from the Baronials. They have their own language, which they would tell you predates the Baronial culture by thousands of years. They train hawks and other hunting raptors like the steppe nomads train dogs. They live in mobile bands of hunter gatherers, eschewing agriculture and settlement entirely, and are constantly alert, via woodcraft, keen eyesight, and the shrieked reports of their avian companions, to the seething movements of the hundreds of thousands of Worms that traverse the forest at all times. Baronials cannot chase them into their home territories, and they are said to be impossible to ambush or surprise while their birds are watching from the air.

They are called Little Birds by their enemies. They lead raids against the Baronial settlements, hunting for trade goods, captives, and alcohol, and the Baronials organise massacres and ambushes of their enemies where they can. This has been going on for hundreds of years. Along the Western forest border, it is understood that an unfamiliar or undomesticated bird is threat, and they are often shot on sight or hunted with cats trained for the purpose.

Little Birds 

Little Birds are hairy and long limbed, with huge, bright blue eyes. They dress in hides and looted fabrics. They make chains and crowns from wildflowers, and rub their bodies with ash and earth, to act as camouflage and to hide their scent from the Worms. Their knives and spears are cold-hammered iron and bronze, and their longbows are of extraordinary quality. 

Whatever procedure the DM uses to indicate that the PCs surprise or ambush their foes is rolled with disadvantage against Little Birds. Whatever chance they would normally have of ambushing the PCs is at +1. 

A typical raiding band will be composed of 10+d10 Fighters, 5+d6 Hunters (looking to become Fighters by taking their first captive), and d3-1 Flower Men/Flower Women. 

Hunter

Stats as a Commoner, but with the morale of a Man-at-Arms. Armed with a longbow and a knife. Doesn't speak Common, and gets +1 to hit with their bow. 

Fighter

Stats as a Man-at-Arms, but unarmoured, and armed with a longbow, a spear, and a knife. Doesn't speak Common, and gets +1 to hit with their bow.  Also accompanied by one of the following bird companions (roll a d4 for each Fighter in the band): 

1. Eagle or Vulture: Sits on the shoulder or between the shoulder blades. Attacks whoever its companion sics it on each turn (this is a free action), using their attack bonus. HD1, terrible claws and beak (d8 slashing), can swoop instead of attacking, which forces the target to make a STR save or be knocked prone.  
2. Raven, Owl: Sits on the shoulder or between the shoulder blades. Attacks whoever its companion sics it on each turn (this is a free action), using their attack bonus. HD1, beak (d6 piercing). Can speak, and translate between Common and the language of the Little Birds. 
3. Hawk, Harrier, Falcon, Kite: Sits on the wrist, and attacks whoever its companion sics it on. 1hp, eye peck (d4 piercing). Can also forgo an attack to attempt to snatch something that a hawk could reasonably carry during flight out of someone's hand, or from their person. This forces a DEX save, and on a failure the bird brings it back to its master. 
4. Sparrows, Robins, Jays, Bluebirds: A whole flock that settles across the shoulders and hair when at rest, and surrounds their companion in a shrieking, darting swarm when in battle. All melee attacks against the Fighter are made at disadvantage, and on a critical failure to-hit the attacker takes 1 piercing damage from a tiny but well-aimed beak.

Flower Man/Flower Woman

An elite fighter and protector of the warrior band. Flower Warriors weave ablating armour suits out of bulky wicker 'plates', which they tie to themselves with sinew, and weave through with hundreds and hundreds of wildflowers. Each panoply is made for a specific fight or raid, and they are not expected to last long. Flower Warriors fight with long, terrible hardwood staves, which had been hollowed out and weighted with lead, and which can crack bones and pulp organs with frightening ease. They are accompanied by enormous, bright-plumed songbirds, princes of their kind, and, it is said, by spirits and pixies. They sing in their alien language as they fight, clear and true. They are the executioners and judges, and infamously practice lynchings, hangings, and cruel disembowelling when they take captives. The Baronials burn them alive where possible, but more usually they fight until they are killed.

HD3, heavy Weighted Stick, Flower Panoply, movement: human, disposition: raiding captains, champions. 

The Weighted Stick will be woven with wildflowers just like the wicker armour of the Flower Warrior, and these flowers are often the homes of motes and fairies. Roll a d4 for each Flower Warrior to determine how many motes they are accompanied by: the Weighted Stick has an equivalent number of charges. Charges can be expended to add cumulative +1 damage to any strike, and while any charge remains the Stick can be used to strike entities as though they were corporeal. 

Flower Panoply counts as heavy armour the first time it is struck, medium the next, light the next, and then falls to pieces completely. It also gives excellent camouflage in any field of wildflowers. It is bulky but not heavy, and floats in water. 

The Flower Warrior's songbird companion counts as an eagle (see above), but while it lives the entire warband roll morale at +2. If it is killed, the Flower Warrior will enter a berserk mourning trance: they fight to the death, and need to be killed twice.