A slightly brighter, and slightly more modified version of the original:  
Prince Drévús is the son to the Shadow Champion Diacroga and the equestrian maiden Princess Amora Goldstar. Prince Drévús at a young age never got to be with his mother, due to the rivarly the forced slave-wife Goldstar had to deal with against Diacroga after Drévús was born. Goldstar wasn’t happy the way Drévús was after he was born, causing the rivarly between her and the Shadow Champion himself. Since then after multiple disobedience choices against Diacroga, he forced Goldstar to be kept in the Shreiker cellar till the day she would soon die. Forcing her to hear the non-stop screams of the Shadow-Cult’s Shriekers.
 
Few years and a century later, after fully maturing out of his larvae stage, Drévús wanted to start his own legion just like his father. Titled, “The Forgotten Swarm”.
 
After a few years later of studying dark magic and how he could use this as an advantage, Drévús went out of his way and left the solitude of his father’s Shadownaught and into the lands of Equestria. There, he grew his legion in vast numbers to overcome the other local hive empires: the changelings and the insectalings. However, despite his gruesome legion, Prince Drévús couldn’t outrank the changelings and insectalings’ armies and was sealed away in a changelings cocoon.
 
However, as the years and centuries went by, the cocoon started to decay and rot. After centuries have passed, centuries since the Super Pony Squad’s arrival and the defeat of the Shadow Champion Diacroga himself, the cocoon gave way and Drévús was free. His legion sent news to him about his father’s death, and so, he VOWED vengeance against the squad and any other forces who dared to get in his way.
 
Prince Drévús was the main villain during the second Arc of the My Little Light story Arc.
 
His legion, the Forgotten Swarm, is filled with the following ranks:  
Terro-Birds  
Huant-Asks  
Swarm Knight  
Swarm Thrall  
Swarm Alocytes  
Swarm Ogres  
Swarm Wizards  
Shadow Sirens  
Grico Bandits
 
Prince Drévús was ultimately defeated during the second arc’s finale when spy finished him off with his ambassador blaster revolver.
 
Drévús made his reappearances in the later seasons episode titled, “Memories of the Past”, where he was in his Ascendent Realm Form. He was reformed at the end of the episode as a guide for the squad and Golstar.