There are a handful of secret armors and weapons that you can acquire in the Sunbreak expansion. However, you can only get them by completing Follower Quests.
How to Unlock the BEST Royal Order Armor & Weapons – Follower Quest – Monster Hunter Rise Sunbreak!
Follower Quests are special quests that you can access during Follower Collab Quests from the Quest Counter. This type of quest will have you accompany a specific NPC on a hunt, and once you've successfully completed that quest, you'll be able to take that NPC with you on future hunts.
Not only that, but completing Follower Quests also gives you some rewards. One such reward comes in the form of secret armor and weapons. Let's take a look at what they are and how you can unlock them.
Before anything else, you'll want to remember that Follower Collab Quests aren't available right away. However, you don't need to reach the endgame either just to perform it. In fact, they will be unlocked once you complete the MR2 quest named "Scarlet Tengu in the Shrine Ruins".