Another classic game from Games Workshop's designers, which involves small gangs fighting for supremacy in the hive underworld. It allows for advance of the gangs as more games are played, as they gain more skills, money, and of course weapons to help them become the rulers of the Under Hive.
In short: a futuristic miniature skirmish game with a well made campaign system.
Here are some files that will help you play a Necromunda with a bit of 5th edition flavor. It's a variant that my group has dubbed Micromunda. included are variant notes, a roster, a weapon list, a skills list and some pregenerated guns for hire. This is version 1.1, updated for typos and a few weapon list inconsistencies.