About a year or so into my most recent embark, I received a message informing me that Rusmo ‘mourog, a forgotten beast, (specifically, a shelled hippopotamus with external ribs and curly emerald hair) had been struck down. Which was strange, since I was still dallying about on the surface, still paranoid from my last fort being annihilated by a fire-breathing pterodactyl thing. Not long thereafter, I found out the cause: "¬sax, Cave Swallow Man Spearman has bestowed the name Mudoung upon a tunnel tube shield!" "¬sax, Cave Swallow Man Spearman has bestowed the name Zosbagnaxob Spug Akul upon a fungiwood spear!" Unfortunately, it would appear ¬sax either could not make up his mind, or was exceedingly forgetful; the blighter began renaming his weapons thereafter, at an alarmingly high rate, pausing the game and zooming into the unexplored blackness of the earth each time. So I placed a note at the place I was forever being dragged to, and had my miners dig there. ¬sax had to die.
There were two odd things when I found him at his camp. Unlike his kin, ¬sax was "friendly," not "hostile." And he was a bit busy. Specifically, he was locked in combat with Ejem ItvidsiŮur Ipizocul, a massive, poison-spitting blob of ash. He apparently didn't think killing one forgotten beast with a wooden spear and shield was enough. And ¬sax is winning; Ejem had a tail at one point, but ¬sax has lopped it off, and Ejem's body is red at the time of writing. ¬sax, although "tired," is unhurt.
I'm not quite sure what I'm going to do about ¬sax. I can't let his obsessive renaming grind my game to a hault, but since he's not hostile I can't attack him. And the fact that he's killed one and a half forgotten beasts to my zero makes me think that might not be wise. Perhaps his obsessive renaming is related to his combat with Ejem; I'll see if I can help him hasten the beast's demise.
(Editted the topic title; there's far more spoiler-y things than a few forgotten beasts and some caverns]