You probably don’t physically reach for GURPS Darkness because it’s just a 17 page PDF, but those 17 pages are jam-packed with content including 6 distinct varieties of darkness.

Edit: I forgot that most GMs don’t even use GURPS Darkness. If you go to the Steve Jackson Games forums you’ll find a 15 year old discussion building darkness from scratch, ending with Kromm coming in to say he just runs it as a Ghost with Weakness(Light) and gets on with his day.

Mini6: You rolled 18d6. Your result looks kinda high. You punch through the darkness and hit the wall you couldn’t see behind it.

Dread: You toppled the Jenga tower. You are dead now.

Shadowrun: Okay so you has a weapon that can attack the darkness? Great.

What’s the the DV and AP of the weapon?
Let’s start on your pool so add your Agility Attribute and weapon skill together.

What’s your personal reach plus your weapons reach? okay, that’s lower than the Shadow’s reach by 2, so take that out of your pool

You took 7 damage so far right? okay so minus another 2 from your pool.

Okay, now roll your pool! 7 hits because of your EDGE limit. Pretty good!

So the shadow, let me see… It’s going to parry because it counts itself as a weapon, so -5 to initiative to add it’s skill to the DEF pool, now add the intuition attribute and reaction attribute to the DEF pool, it took 2 damage which is -0 to the pool… okay I can roll now, I got 5 hits.

So, 7-5 is >0 so let’s add your DV from your weapon, so you have (7-5)+(2+STR) and the AP of the weapon was -3. So, looks like this shadow’s Armor is less than that, so it’s going to be physical damage.

So, now the shadow will roll BODY+Armor-3 as a pool, then subtract it from your hits… and it got 4 hits. So 5-4= 1, you did one damage.

…oh sorry, you have 6 more attacks this turn? And your teamates are summoning ghosts to deal with the Shadow, and Sarah is going to …hack the shadow?

Okay, give me a second…

Exalted: The darkness turns out to be a component soul of the Ebon Dragon and now it’s angry. Fetch another bucket of dice and roll to Join Battle.

Battletech: You land a through-armor crit on the darkness’s hip actuator. The darkness falls – let me check that table – on its left side and probably won’t be getting up again any time soon.