This page of the Immortals Fenyx Rising guide includes a walkthrough of the Bolt from the Sky main quest. The quest activates once you complete Aphrodite's quests.
The task is to find and rescue an injured bird called Phosphor. To do this, get to the marker on the map by climbing one of the mountains. That's where you'll find the wounded bird.
Once you get on the scene, a cutscene will play. After the cutscene you will have to go to a new location, deep into the region of Typhon. The task seems very simple and so it is. While on your way to the new marker, you will see a seed that you need to pick up. No trap will activate. After picking up the seed, you will have to go back to the wounded bird.
Be careful of the enemies you may encounter, because at this stage they can cause a lot of problems. Nevertheless, this quest can be completed without a fight. After picking up the seed, return to the injured bird to complete the quest.
After completing the task, Phosphor will be able to help you throughout the game. In addition, you may also change its appearance and attack features in your equipment.