My first mods, just now. Each space is one where I started over from scratch. In order:
The very first thing i did was randomly swap the names of several of the objects txt files,as I've heard stories how people essed up something and wounded up with a totally messed-up world that made no sense. At first, nothing happened. Went and switched some more filenames, game crashed on worldgen.
Then, I tried to start being more subtle in my screwing with the world. give dwarves magma blood by changing all those "blood" tokens in their data definitions to "magma". Didn't do anything.
Then, I changed every parameter from spec_heat to liquid_desnity of the "skin" material to 0. Every living thing literally combusted.
Then I changed the melting point of all bones to 0. Every living thing just collapsed into a puddle of blood and organs.
Then I changed the melting poitn of some flux stone types to 10. Nothing happened. Then I gave all soil the melting_point parameter, and set it to 0. Nothing happened. Finally, did the same to all minerals, still nothing. 9I wanted my evaporating, collasping world, but oh well.)
Then I tried to give dwarves the entire body definition of whale sharks. Didn't work, crashed them game.
Then I tried with just the first set of body parameters from cave crocodiles onto dwarves. Still crashed the game.
Then I swaped the -entire- data blocks for dogs and giant desert scorpions (excepting ordinary pet, trainable, and value tokens), and embarked with tame scorpions. Took to long to try and dig something out so I could make a kennel and train the scorpions to attack, got bored and left.
Then I went back to the melting flesh idea, and did the first thing I did with skin, but to eyeballs and teeth. When the game started, every living thing's eyeballs and teeth instantly combusted. Small animals like cats bled out, everything bigger survived, put themselves out, and i was left with eyeless, toothless dwarves. Then I decided I should go back and be more careful about that "ignite_point" parameter. This time, dwarves eyes and teeth instantly metled out of their heads, but no fire. Also, somehow, two of my embark dwarves instantly went into romance and became loves, leaving their happiness at ecstatic despite having no eyes and teeth. Then I went back and looked at the bones parameters, from impact-Yield to torsion_yield, and changed -everything- to 0. Eyes and teeth metled out, but bones did not instantly turn to powder in their bodies. I was disappointed. Then I went back and set the melting point of skin, fat, muscles, and kidneys to 0. left all nerves, brain, and organs, and sinew. Everything bled to death instantly.
Then I tested removing the blood tokens from the dwarf data specifically and making their skin and fat melt. Was a success, fat and skin instantly melted, but no one bleeds at all.
Then I went back to that previous "everything is metling except nervous system and organs" and removed the blood tokens. This time, rthe dwarves actually just melted to death.
And then I decided I was done. Enough for an hour's work.