The mini-challenge task of the Royal White Horse was picked up at a post station outside the plain, which is located in the northwest of the initial platform and on the left side of the arena ruins. Find an NPC named "Totez" in a post station outside the plain, and you can get the task by talking to him.

1. Go to the post station outside the plain.

A post office outside the plain

2. Find NPC· Totz at the entrance of the post station, and you can get the task after the conversation.

Npc todts