With all three Pendants of Virtue in hand (Courage, Power, and Wisdom), return to Hyrule Castle. Head to the castle's courtyard, and you'll find a new path has opened, leading to the pedestal of the Master Sword. Approach the pedestal and interact with it to claim the legendary blade. The Master Sword significantly increases your attack power and is essential for defeating stronger enemies and bosses.
Immediately after obtaining the Master Sword, Yuga will appear, capturing Princess Zelda and transforming her into a painting. He then opens a portal to Lorule and escapes. You, too, will be pulled into this portal, landing in the desolate land of Lorule. This marks a significant turning point in your adventure, as you now have a powerful weapon but face an even greater threat in a much more dangerous world. Prepare for a stark change in scenery and enemy difficulty.