A forgotten beast with a body of snow arrived in a cavern I had yet to build down into, visible under five or six levels of empty space beneath the central stairwell. I thought I could throw down some disarmed goblins, one goblin would get a lucky shot and blow up the snow beast for me. After a few goblins dying from the fall alone, I carved some tentative stairs down a cavern rock pillar, but still three levels above the huge bad guy. The next few goblins got knocked out or stunned from the pain of the fall, then frosty would come along, push them around (I imagine into the rock walls of the cavern, breaking their bones), and spit frozen venom at them when they collapsed. The best of the goblins was a mace lord who scrambled away a few times before the beast held him down and let a bunch of poison ice fall out of its mouth and crush him ("Bleeeh").
Because the goblin sacrifices kept taking too much fall damage to fight the beast competently, I tried throwing a goblin spearman to land on a convenient tower-cap. I thought it would be one less level of fall damage, and the beast would shamble over and fight the less-harmed goblin stuck in the tree. The titan never showed up, I think because the goblin was never actually touching the ground. He got a broken elbow landing in the underground treetop, but came out of pain pretty quickly. After this, nothing was wrong with him except he was disarmed, naked, and stuck in a tree with a broken elbow. I was fine leaving it at that, but the dwarves saw him down there, and kept cancelling sleep. No one wanted to go to bed with this fucking goblin stuck in this tree. No one wanted to mine some stairs so I could send hammerdwarves down to kill him (galena is the only metal I had found, which yields lead and silver if you didn't know).
I drafted a peasant to be a heroic marksdwarf and shoot that annoying fucker out of his tree in the enormous cellar so the dwarves could get some sleep. Squads. Archer. Dodek Tealface. The first thing the conscript did was go outside to walk across the map and pull some swanky gloves off a partial skeleton. Then my new agent of death climbed a few flights up to some bins to get a new pair of cougar pants. Then he had a drink. Then he went to bed. Since he sleeps off in a barracks now the goblin didn't bug him. I tried adding dwarves to the squad but was still getting spammed with sleep cancellations, so I tried a cave-in.
A cave-in necessitated that I channel out two up-down stairs on the apartment level and most of the corridor tiles that lead off to some statue chambers and floodgated (empty) goblin jails. Apparently I did not plan the cave-in too well because my miner who came with the original seven fell and broke an arm and ankle, and a converted jeweler who just graduated to Miner broke his neck. The main cave-in block landed on the goblin and apparently reduced him and the tower-cap he was stuck in to a fine powder. I think the fallen miners were stuck waffling between digging the channel, and cancelling the channel because they could see the goblin.
I finished carving the cavern stairs from above and some dwarves recovered the wounded and the corpse. Since there were now dwarves on the floor, the forgotten snow beast was soon along to spit on some people. A newbie hammerdwarf tapped the monster with a silver war hammer and it exploded and died, being made of snow.