Chapter 70 adds ranged weaponry, and a targeting interface.
Chapter 69 adds even more mushrooms and fungal beasts, and an exit to the Dark Elf lands.
Finally a use for the mana bar! You can learn spells from books, and cast them at your unwitting foes.
Chapter 67 introduces multi-tile enemies, and enemies with ranged attacks. These culminate in the creation of a terrifying dragon!