I've created THE GAUNTLET. It's still under construction, but it's a whole FUN PARK of dorfly execution.
1. First we've got 9 weapon traps and 6 cage traps in 5 alternative lines of 1x3 to thin the herd, with the weapon traps full of 10 serrated spinning blades and giant axe blades. I always use traps full of 10 and my masterwork mechanisms so that I can get my traps nice and visceral.
WWWW
TCTCTBBB
TCTCTBBB
TCTCTBBB
WWWW
2. Then they go down a ramp (which is normally a drawbridge, allowing the merchants free access) and walk across a 1x10 tightrope challenge, lined with additional 10xserrated blade weapon traps.
WWWWWWWWW
R,,,,,,,,,,,,,,,,,,,,R
RTTTTTTTTTTTR
R,,,,,,,,,,,,,,,,,,,,R
WWWWWWWWW
3. Of course, on either side of said 'tightrope' is going to be markdwarves shooting at them, and already a pit on each side leading to a 3-z level drop onto lines of upward spike traps filled with 10 spikes each.
4. Courtyard. By this point it's assumed they're dead or weak so I'll probably just put a battle area for my dwarves. However, I was thinking of putting a drowning chamber here because I'm right next to a river.
Now it's only 3 years in, so I don't have access to anything fantastic yet, though the iron and steel industry is booming. I'm trying to make this as deadly yet as fun for the goblins as possible whilst still being simple. Quite frankly I suck with advanced stuff like repeating traps lol. If anyone has any ideas, I need them lol.
I also have a dream of creating a rancor pit with voracious cave crawlers, but that never works due to the dwarves being exposed to immediate evisceration.