When the Deliverance, a group of resistance fighters dedicated to liberating Zofia from Desaix's tyranny, stormed Zofia Castle, Slayde helped establish a body double of the Chancellor. Amidst all this, Slayde serve Desaix well. Soon after, the Chancellor completed his coup with the assassination of Lima IV. The Rigelian Army remained garrisoned in Northern Zofia, and Desaix imposed heavy taxes on his subjects in the name of compensating the Rigelian Empire. Desaix negotiated a cease-fire in exchange for control of Zofia as Chancellor. Years after Slayde's second failed assassination, war erupted between Zofia and Rigel. Unfortunately, this incident forced Celica to leave Ram. He prepared to make up for his botched assassination, but was driven off by Mycen. Encountering several children playing in the forest, Slayde demanded that they bring him and his men food and lodging before recognizing one of the girls as Anthiese, though she now called herself Celica. Sometime later, Slayde and a squad of his men came upon Ram Village while patrolling Southern Zofia. However, two children survived the night: Princess Anthiese, who was rescued by the knight Mycen, and Prince Conrad, who fled to the Lost Treescape of Rigel. For his role in the Villa Fire, Slayde was promoted to captain of Desaix's guard. That night, Slayde set fire to the Royal Villa, while assassins slew anyone who didn't perish in the conflagration.

Though initially reluctant to slaughter children, Slayde quickly agreed when Desaix promised him wealth and power. As part of his plan, Desaix ordered Slayde to kill the royal heirs. One day, he was summoned by Desaix, who had ingratiated himself with Zofia's King Lima IV, but was secretly accruing power for himself and planning a coup d'état against the royal family. Originally, Slayde was a minor soldier in the Zofian army. Furthermore, Slayde is a coward who will betray others to save his own life. Slayde is also willing to compromise his principles in exchange for wealth and power, such as agreeing to assassinate the young Zofian heirs for Desaix, despite being hesitant to do so before the baron offered him a reward. He arrogantly assumes that having a high rank makes him superior to everyone. Slayde is a corrupt knight who cares for nothing but to satiate his greed.

In Shadows of Valentia, his hair is much shorter, he has a beard, and his armor is now maroon with gold accents. In Fire Emblem Gaiden, he is clean-shaven with a large mullet hairstyle, and his armor of purple. In both games, Slayde is a purple haired, armor-clad man.

The last bastion fire emblem