30. If all Divine Beasts are defeated, how much of Calamity Ganon's health will be removed at the start of battle?
From Quiz "Breath of the Wild" - The Road to Ganon
Answer:
Half
When Link starts into battle with Calamity Ganon, the Scourge of Hyrule Castle, all of his hard work thus far should pay off. To begin, all Divine Beasts cleared throughout Hyrule will result in the Champions being able to contribute their strength, knocking an eighth of Ganon's health off his health bar (maxing out at half of his total health). Additionally, the Master Sword will do additional damage and be unbreakable during this fight, so it's the easy go-to if Link has recovered it. If Link can defeat Calamity Ganon, who'll cycle through attacks brought on by all of his blight forms, climb the walls, and don a near-impervious shield, then he'll burst in into an explosion of malice.
...but it doesn't end there.