Link dismounted after reaching a massive tree in the forest and ventured through a door in the side. This tree was laid out very similar to the Forest Temple. As he warded off shadow beasts, he climbed higher and higher until he reached a hollow space just below the big limbs. There he saw Celestia lying unconscious in front of a hole. He looked out and saw Canterlot in the distance. Then, he heard Zelda's voice in his head.
"In order to weaken Ganondorf, you must charge the princesses with the power of the light arrows. To do that, you must shoot them with the arrows."
Pulling out his bow, Link nocked one of the light arrows. Drawing it back, he took aim and let the energized arrow fly. Celestia felt a sharp pain as the arrow jabbed her in the chest, but the pain subsided after five seconds and she felt the power rushing through her veins. Opening her eyes, she stood up and eyed Link.
"Have you been sent to save Equestria?"
"Yes I have. My name is Link. You must be Princess Celestia," Link replied as he knelt down.
"Pleased to meet you Link. I am aware of what has happened to Neighsay. His medallion is what gives him his power. I wish you good luck with waking up the other princesses."
After Celestia had determined her line of fire, she laid back down to rest. Link decided to shoot a bomb arrow as a signal when he was ready for the spirit power to be deployed. He mounted Epona and set off for Luna.