Nightmare Fuel / Temeraire
from the previous book(s) in the series are unmarked.
- The use of dragons in the Napoleonic Wars. Imagine what it would be like to be on a ship that's destroyed at the hands of a dragon, particularly one that spits acid.
- Heck, the spitting acid is disturbing enough. A random french dragon gets hit in the face with a lot of acid towards the end of His Majesty's Dragon, forcing her captain to Mercy Kill her before things can get any nastier. And one of Lily's harness-men dies in Empire of Ivory by falling from a cliff after acid in a handhold destroys his hand.
- Traditional dragonfire is no treat either, but at least you tend to die horribly faster.
- Ground combat can be leagues more horrifying; as dragons abscond with entire cavalry units, and gouge bloody furrows through rifle companies.
Empire of Ivory
- The plague. Lenton has a Heroic BSOD when Obversaria dies, and after one finds out the details, one doesn't blame him in the slightest.
Tongues of Serpents
Crucible of Gold
- The aftermath of the Allegiance's destruction. Three dragons flying for three days straight over the open ocean with next to no rest, 200 or so passengers between them, and no water is at best an extended Oh Crap! moment for the reader. And at least as many people dead by either the explosion or exposure to the freezing water of the ocean.
Blood of Tyrants
- Russian ferals are kept on the brink of starvation, and their wings are kept chained so they can't even fly away. A clever French officer gets the idea of turning the starving ferals into a weapon by unchaining them and setting them loose. The dragons are so savage that they actually begin to eat the wounded (human) soldiers - something no sane dragon has been seen to do in the series.