Azure Meteorite
At the end of the day, the Saphirelake Military Academy did not only allow Descendants to stretch out their helping hand. They also allowed Berserkers and Warlock Centaurs to help out.
At first, the Berserkers and Warlock Centaurs didn't see a reason to help the humans in the Sacred Desert. Most humans had been discriminating against them for years until Michael and some others appeared to support them. Only now did they create an academy where everyone from the Tritan Alliance could apply.
Despite the Tritan Alliance's initial problems, the situation has improved greatly since last year. The Berserkers and Warlock Centaurs didn't feel that helping the Lords in the Sacred Desert was a bad idea.
First, they were war-loving races. They enjoyed fighting the Undead forces, and that was what they did. They joined the Descendants and fought the Undead forces with their tremendous physical prowess. They were stronger than most humans and showed that clearly.