Spoiler warning: Plot or ending details follow.

"After Ganon was defeated by Link, the remaining Malice pulled itself together to form this bestial creature. Its appearance and fiendish magic earned it the name of Dark Beast. This form is considered to be Ganon's original, although in this state, his awareness has been consumed entirely by Malice, and all he knows is a desire to rampage and destroy."
— Hyrule Compendium description

Dark Beast Ganon (魔獣ガノン Majū Ganon?, Demonic Beast Ganon) is the final boss in The Legend of Zelda: Breath of the Wild. Like his incarnation from The Legend of Zelda: Twilight Princess, Ganon appears as a monstrous boar demon with a mane of violet flames and a body made of pure Malice. Link fights Ganon from the back of his horse while using the Bow of Light provided by Zelda.

Despite his intimidating appearance, Dark Beast Ganon is a large, slow target. His only means of hurting Link are stomping on him with his massive hooves and firing a beam of dark purple energy from his mouth; both are heavily telegraphed and easily avoided at a distance. After a while, Zelda will use her magic to create glowing sigils on Ganon's body; Link must shoot these spots with the Bow of Light to damage his calamitous foe. After Link hits seven sigils (three on each of Ganon's sides and one on his underbelly), Ganon will open a seam on his back, revealing a cluster of demonic eyes (the core essence of Ganon, according to Zelda). Using the updrafts left in the wake of Ganon's beam attacks, Link must paraglide upwards and fire one last Light Arrow into the largest of the eyes, weakening Ganon to the point where Zelda can finish him off.

According to Zelda just prior to the boss fight, Ganon achieved his Dark Beast form by abandoning his cycle of reincarnation, pouring all of his strength into a final attempt to lay waste to Hyrule. As such, his defeat at the hands of the heroes may be permanent; on the other hand, Zelda implies that she only sealed him away once more, opening the possibility that Ganon may return yet again.

Spoiler warning: Spoilers end here.

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