How to Access the Trials:

Each teleport waypoint has an Avian Spirit Trial (or 2 in one specific one) attached to it. You do not have to teleport to the waypoint to start the trial, but just have it unlocked.

When you complete the trial and get all 3 stars, the icon of the waypoint will change, and the number of stars obtained will be visible next to the name of the trial.

ALL TRIALS ARE COMPLETELY SKILL BASED - PROGRESSION DOES NOT MATTER

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Rewards:

Each trial has the following rewards (except the puzzle ones):

1 Star: 5 Secret Letter Clues 

2 Stars: 500 Carmine Globules (aka Demon Wedge Enhancement Materials)

3 Stars: 30,000 Coins

There are a total of 22 challenges, and the total rewards for completing all of them at 3 stars are 110 Secret Letter Clues, 8500 Carmine Globules, and 510,000 Coins