Every word has a nature
Over sixty thousand words, each read for what it means: torch is fire, glacier is ice, wolf is beast. The words marching on you are no different.
Answer with the right one
Water drowns fire, fire burns the woods. Type the word that counters what's coming, chain words letter to letter, and set off reactions. Each word only once a run.
Spend your letters well
Every letter you type is one you've collected. Loot more from the fallen, trade with the merchants between chapters, and pick up glyphs and seals that bend the rules.
Survive the book
Each chapter brings a twist, and something worse waits at the end of every act. Die, earn ink, grow stronger, and read on.