Any other ideas about flavor?
Give me a moment or three...
A lithely powerful humanoid with the head, tail and black fur of a panther. It has the claws of a great cat but wields weapons like a human.
Werepanther thralls are humanoids who have been transformed into lycanthropes by a panther lord. They have three forms, of which their hybrid panther-humanoid form is their favorite. Werepanther thralls enjoy taking animal form when hunting or indulging in feline recreations, but usually only take humanoid form to conceal their true nature from outsiders. A thrall's humanoid appearance is drastically altered by its lycanthropy. Its hair and skin have darkened and their features shifted, rendering the thrall nigh unrecognizable to anyone who knew them before their transformation. A dead werepanther thrall reverts to its pre-lycanthropy appearance.
A werepanther thrall's temperament has many of the worst traits of a great cat. Arrogant, secretive, and cruel, they delight in tormenting their victims like a cat playing with a mouse. They also have a feline fastidiousness, and keep their persons and equipment in immaculate order. They rarely fight among themselves, despite their chaotic and evil natures, because of the magical control their panther lord has over them.
These creatures typically live in hidden hamlets. All the menial labour is performed by captured slaves who are savagely whipped at the werepanthers' whim. If they happen to capture a particularly strong individual, that person is usually taken to the panther lord to be transformed into another werepanther thrall.
The werepanther thrall presented here is a 1st-level human warrior using the following base ability scores: Str 13, Dex 11, Con 12, Int 10, Wis 9, Cha 8.
In hybrid and animal form a werepanther thrall is more massive than their humanoid form, weighing roughly 50% more. Their hybrid form is approximately 10% taller than the humanoid form, while their animal form has a body length (excluding tail) roughly equal to the humanoid form's height.
COMBAT
I also fancy rewriting the tactics, but we can leave that for later.