My previous (and first) orc fort met it's end under water. Nothing unusual, all orc forts built in scorching sands of untamed wilds without river meet their end under water. Probably something related to "oops, wrong lever" syndrome. Due to early unplanned flood i haven't chance to see orcish royalty before, so here is my first experience with them.
Orcs don't have kings, instead of kings they have Lords. Up to 12 of them at once it seems. (never ever build paved roads in your dining hall to check if orcs love roads as much as dwarfs, roads your last frontier between you and Lords, who decided to make your fort new Mountainhome, and of course it's necessary to spawn on terrifying side of surface instead of joyful wilds side, to gather some afflictions on not so long way into fort.) Unlike kings, Lords don't need any rooms, chests etc, but they are nobles and want to order their favourite dices, animal traps and other crap, which you aren't necessary able to produce at all. And it's mandatory for them to order this right when next ambushers/siege spawned and you can easily miss demands. On unrelated note - it's more simple to create one slab rather than waste resources on crap and read how some useful legendary fort member was beat to death because demands wasn't fulfilled.
1 Lord was Uruk in age below 30, he joined to fresh military squad instead of another Uruk, who had bodysize slightly below useful and wasted half of year before i understood why whole squad aren't training. (bodysize 74470, one orc manual state they need bodysize 80000 to use big weapons with shield, another 75000, therapist weapons tab show he can use mauls with shield, but tooltip in same tab states 77500 minimum required.. he carried both - shield and maul without issues, but avoided any combat and raised wrestler only skill when i forced him to fight finally)
2 Lords was dreamwalkers - rare breed, good creativity guaranteed, so they joined to bifrost generator team.
8 Lords was completely useless. They joined some 2-man early squad, got uniform "no gear" and personal orders to station in recruit adaptation area (room with prisoners caged above to drop them on rookies).
Last Lord was some very old Snaga, she haven't arms or something like this, and could die from old age in any moment. Probably that's why she issued 3 demands before finally arrived to her lovely burrow (I had only 2 burrows, 1-st "Safe zone" and 2nd is "Execution area" located under "drawbridge of justice") Up until this moment "Execution area" was unused, unlike pasture in same area for unwanted pets.
So.. 8 useless lords with hands got whole room (11x11) filled with prisoners (invaders, grimelings, beak dogs, all kind of giant ants, beetles, horses and whatever else terrifying biome and invaders could offer) dumped on them at once. It was massacre.. All lords survived and became elite wrestlers ._. Took few seasons after to gather them in burrow under "bridge of justice". Reaction to burrow assignment in 5x5 area with 200+ fort members and 300+ animals sooooo slooow.
2 Lords Dreamwalkers became legendary armor smiths before lost their sanity. They didn't had proper personality for this kind of job
15 wasted prisoners because one of them went mad with recently acquired "doesn't care anymore" tag. He isn't met death under bridge, because he still wear masterful bifrost gear set. Also i am not sure how to move him there anyway, other guy simply moved to assigned burrow despite of madness.
Last Lord Uruk still alive and got custom profession "Highlander". But he doesn't really care about it anymore. He didn't had single mandate or demand from start, so i still have no idea what he likes ._.
tldr: Meet orc royalty with drawbridges. Magma. Flood chambers. Whatever you wish, just don't waste prisoners on them.