I love fighting forgotten beasts so I tend to tweak the worldgen parameters for more of them. My current fort has reached the stage where, with luck and careful mining, I have a fully adamantine armoured and weaponised military, so so far we've (touch wood) diespatched all our uninvited guests. In my current fort so far...
The Forgotten Beast Doto has come! A huge quadruped composed of bone opal. It has large mandibles and it squirms and fidgets. Beware its poisonous vapors!
The Forgotten Beast Rusmo Ebr†sodor has come! An enormous quadruped composed of marble. It has a twisting, jointed trunk and it undulates rhythmically. Beware its webs!
The Forgotten Beast Stran has come! A towering feathered sauropod. It has a curling trunk and it squirms and fidgets. Its scarlet feathers are long and broad. Beware its poisonous sting!
The Forgotten Beast Reksas has come! A gigantic blob composed of vomit. It has an enormous shell and it has a bloated body. Beware its deadly spittle!
The Forgotten Beast Mithmis Žs Arel has come! An enormous quadruped composed of flame. It has a spiral shell and it squirms and fidgets.
The Forgotten Beast Xosun Arutosl– has come! A gigantic feathered scorpion. It has a square shell and it appears to be emaciated. Its gold feathers are patchy. Beware its poisonous sting!
The Forgotten Beast Muved has come! A gigantic feathered fly. It has a round shell and it is slavering. Its jade feathers are downy. Beware its webs!
The Forgotten Beast Romi Ome Efeye has come! A towering scaly crab. It has two stubby horns and it has a bloated body. Its cinnamon scales are blocky and set far apart. Beware its deadly spittle!
The Forgotten Beast Rethi CuthabecŠthutha has come! A gigantic scaly sheep. It has two short tails and it undulates rhythmically. Its slate gray scales are jagged and overlapping. Beware its poisonous bite!
I think Rethi is my favourite, for being a giant scaly sheep. Although Romi Omi Efeye has a nice name - say it out loud.