Prove that your spirit is worthy of the Sentinel mantle. Complete the trials, master the training grounds, and demonstrate unwavering resolve. Only those who rise above their limits will ascend as true Sentinels. To do this, collect Sentinel Medallions from the captain in /outfield. After that, defeat Galahadiel for the Sentinel Star Crest. Though he is only here with us in spirit, Galahadiel was the king of sentinels. He served this kingdom for a century and won all battles he partook in. He is humanity's strongest warrior.