Cultural Quirks of the Subterranean Humanoids

It's grim.

d12
1. An artsy bunch: when not engaged in standard mayhem they stay busy crafting hideous decorative objects in all media from any available materials, some produce skillful depictions of skulls, implements of war, terrifying monsters that clutter every wall and horizontal surface, others extemporize hateful lyrics to relentlessly unpleasant newly improvised tunes
2. Practice daily ritual bath in vat filled with tiny filth-eating insects, renders humanoids fresh and clean, feels funky
3. Money composed of gold caltrops, silver axe heads, copper projectile points, IOUs written in blood, secured by suicide pledge
4. By ancient treaty, each city ruled by council of elders from neighboring city that hates their guts
5. When indebted, they say thank you by murdering someone you hate
6. Coming of age ritual involves getting lost in the wilderness for 1d6+2 years, if caught before this time elapses: summary execution
7. Potentate recently ordered use of perishable Underfruit as legal tender to bolster short term spending
8. Excellent, highly productive builders but saddled with aesthetic sensibilities of honeybees, its all endless stacks of hexagonal cells
9. It takes a village to ensure that all the children are properly pre-traumatized to prepare for hardass martial lifestyle
10. Casual eugenics program starting to pay off, population down but healthy, muscular, just-brainy-enough, and thirsty for conquest
11. Just short of death sentence: conscription into Literary Corps, forced to learn to read for lifetime of hellish scholarship
12. Mores hammer home the point: life sucks, death will be awesome, but no one is allowed to die until they perform 12 services to the state