Here's why:
* "Barbarian" is a loaded term: It carries a lot of historical baggage and often refers to people considered uncivilized by others, so a specific collective noun might feel insensitive or inaccurate.
* Varied meanings: "Barbarian" can refer to different groups with different cultures and ways of life, so a single collective noun might not fit all.
Instead of a specific collective noun, you could use more general terms like:
* A horde of barbarians
* A tribe of barbarians
* A band of barbarians
* A swarm of barbarians
You could also use a more descriptive phrase, depending on the context, like:
* A fierce band of warriors
* A raiding party
* A group of nomadic people
Remember that using the term "barbarian" can be problematic, and it's always important to be respectful and mindful of the context.