I got a siege of 50 [SIZE:24] orcs.
Just to see what would happen, and because all the animals were slowing down the game, I sent out the 30-odd War Polar Bears.
In fairness, I completely expected them to get slaughtered, but then I found out something interesting...
They're GODDAMN BEARS! The closest things to dwarves with fur!
Somehow, these size:8 lovable white critters managed to kill most of the Orcs.
One of the survivors* has a title 'Urist NerridSiz Ertong', which apparently translates to 'Dagger GrindGrease the Gerbil**. He has a lung missing, only one eye, and is soaked in blood, but no other wounds***.
So anyways, I'm currently seeing if I can build a huge memorial tomb to an animal. So far it has a river of magma, some chained wolves and is built in the form of an massive bear (aboveground construction).
ATM I just need to finish building the head - it's taking a while due to the copious amounts of pumps needed to transport the magma up to the eyes, where it shall flow out in a huge world-burning torrent.
Once this is done I may abandon, so as not to sully the sacred Fort of the Bear.
Alternatively, I could chain up as many female polar bears as I can in the monument, or see how many sieges Urist can fight off, then entomb him in the Steel Coffin**** in the Head of the monument, just behind the magma eyes.
Or maybe in the Heart instead, in the oubliette in the center, accessible through a single tunnel through the 6x6x6 chamber of magma*****.
*Sent in all 8 Champions to mop up the rest of the Orcs, 2 died.
**checking in legends later, he apparently killed 14 of the orcs. Most megabeasts in my game kill around that number of anything, then usually die to Orcs.
***Not quite sure how the Orcs managed to mangle a lung without damaging the bears chest. Perhaps some kind of phase-spear?
****Said steel coffin is currently encrusted with every gem I can get my hands on, and studded with nearly as many metals. Just need to finish up with the bone + leather decorating and it'll be fit to be placed.
*****Because all monuments need a heart of Magma.
]Tl;dr Polar bears are made of win, RNG is awesome, and you can never have too much enough magma in a Monument.