A voice spoke, "So what was this promise you made? About the master emerald Knuckles." It was Sonic. The other voice, Knuckles spoke, "It was made before I even met you and Tails. And I still kept it to this day."
Angel Island: Past
A red young echidna was there playing with the other echidnas. Until he heard a call. "Knuckles come here at once." The young echidna named, Knuckles, went to an adult male echidna. He spoke, "Yes father." His father spoke to him firmly. "You see Knuckles I have something to show you." His son nodded and follow him to see a humongous sized green gem. "Woah! What is this father?! It looks like a gem." "It's called the Master Emerald. It whats control the chaos emeralds. Passed down to our family. Generation to generation. It's our duty to guard it. After I die it will be yours to guard."
Knuckles was interested, but then felt uneasy about this. He said, "But father what if I'm not ready? What if I'm not strong enough to guard it?" His father chuckled and sat next to him. "Don't worry son. You are ready for this. I believe you." His son became happy then a guard rushed in. "Sir! He's here!" "Damn it. Why now? Look son I want you to stay here." He says as he left. Knuckles stayed with the master emerald and was worried about if his mother and father is ok. Until he heard explosions in the island. The whole island was gonna explode. He rushed through it until he see the echidnas getting caged in them. He even saw his parents. When Knuckles tried going to them it was too late. And he never saw them again.