Let's discuss game breakers.
From YMMV/Dwarf Fortress - tvtropes.org:
Are ballistas game breakers? One ballista itself seems to be able to hold off huge raids.
Dwarven lightsabers/hypersonic hammers?
Weapon Traps are considered to be game breakers by some due to the massive amount of damage they deal. Likewise for cage traps, which unfailingly captures anything that isn't immune to traps, even megabeasts (and if you put a Giant Cave Spider web on it, it catches anything)
Economically, stoneware pottery. Fire clay can be gathered indefinitely and stockpiled near a magma kiln, which perpetually churns out crafts and large pots. Considering that stoneware can hold liquid without being glazed, you will never have problems with booze again. The value of stoneware crafts is comparable to obsidian, but are much easier to mass-produce; a few years of constant production will give incredible purchasing power.
In Adventurer mode, sneaking and finding a tile where rocks can be picked up that close to the enemy's range of vision. Then you can throw the rocks until he dies (or passes out, at which point you can walk up and slit his throat), without ever being seen.
You can make a small room full of low-quality menacing spike traps. Fill those traps with practice spears. Attach them to a lever or repeater. Station a squad of dorfs in the room and watch their dodging, blocking, armor using, shield using, and weapon skills go up at a ridiculous rate. As a bonus, if any of them actually manage to get hurt, it gives your doctors practice, too!
Are there any more game breakers? Should these be removed or updated?
What are your thoughts?