Brand new fort. I've been lucky enough to get some interesting caverns with this one, including a "Deep Pit". I'd already dug down to one part of the cavern at z -13, where there was a handy lake.
Across the other side of the lake, near the deep pit, the Forgotten Beast Anot appeared. A gigantic theropod with external ribs, it had two long curly tails and it undulated rhythmically. Its dark violet feathers were fluffed-out. We had to beware its hunger for warm blood.
I promptly dug down to it from ground level, since my militia had already seen off Aco Gasinsporro Corud Atup (Roc), Nonu Osmuzan Otar Mosmio (Giant), and Yonall Inevisethe Leriamu (Jungle Titan). Yonall was the first, and the worst to date - went through an entire squad at first. Given how toughened they were by the experience, there was no sense in putting it off.
Disappointingly, Anot didn't last more than a single hit. Even Giant Cave Spiders have presented more of a challenge. And Forgotten Beast Biscuits taste funny.
So now to investigate the Deep Pit, since I was now on the "right side" of the lake. I dispatched my miners to dig stairs straight down the edge of the pit, into another cavern at z -31.
And promptly, Ak Sodoroson, Forgotten Beast, appeared. A towering scaly earthworm, it had thin wings of stretched skin and was slavering. Its flax scales were round and overlapping. We had to beware its webs. In any case, Ak wasted no time in climbing the newly carved stair case. An unsuspecting farmer, Ast Babinzuglar, was busily collecting webs right next to the pit. Ak Sodoroson, Forgotten Beast, drew itself up to its full height, roared menacingly with spikes of adamantine, rushed at the farmer ...
... who jumped away, just at the right time for Ak Sodoroson to plummet from level z -13 to -31. He's now being made into Forgotten Beast soap, or something equally useful.
*facepalm*