For Season 5.0, Son of Whyachi was completely rebuilt with a new hammer setup, new design and a new set of wheels. Due to being a former champion and competing in last season, Son of Whyachi was allowed to skip the preliminary rounds of Season 5.0, where it eventually fought Steel Reign. Before the fight, the Steel Reign team had converted Steel Reign into a ramming robot
In the match, Son of Whyachi started spinning its hammers and Steel Reign gets hit a couple of times. Steel Reign tries to drive into Son of Whyachi again to stop its spinning hammers, but it was having steering problems and Son of Whyachi kept hitting Steel Reign multiple times. Steel Reign brushes up against Son of Whyachi with its side, allowing small pieces of armour to be tossed around the BattleBox. Then a big collision sends Steel Reign over to the kill-saws and Son of Whyachi goes sliding into the base of a screw on the other side of the BattleBox. Steel Reign goes straight at Son of Whaychi, but Son of Whyachi escapes and later gets caught on the kill-saws. Steel Reign comes close to stopping its spinning hammers, but as Steel Reign is knocked back by a blow, Son of Whyachi brings it back up to speed. Steel Reign pushes Son of Whaychi into the other base of the same screw. Steel Reign drives into Son of Whyachi again and gets knocked into the screw itself. Steel Reign attacks Son of Whyachi with its spinning thresher and one hit instantly snaps the thresher in half, throwing a big chunk into the corner of the BattleBox. Steel Reign chases after Son of Whyachi, which appears to gently slide away after every collision. Two more hits from Son of Whaychi and now pieces of Steel Reign's armour are coming off. Son of Whyachi hits Steel Reign again and a side panel is thrown off of Steel Reign. Son of Whyachi rams into Steel Reign and sends itself sliding across the BattleBox. Steel Reign is no longer moving properly because from the hit that came immediately before the one initiated by Son of Whyachi, Steel Reign's frame was broken and bent into its tire, making it very difficult to move that side of the robot. Son of Whyachi comes over and starts to attack Steel Reign. Finally, after several additional blows, Steel Reign stopped moving and Son of Whyachi does a victory spin as it was being counted out. Son of Whyachi won by KO and advanced to the round of 16, where it faced No Apologies.
Throughout the match, Son of Whyachi was unable to reach its weapon's maximum speed due to a bad battery. In the end, No Apologies won on a close 24-21 judge's decision and Son of Whaychi was eliminated from the tournament.
Son of Whyachi couldn't participate the super-heavyweight royal rumble at the end of the tournament because the rest of the rumbles were cancelled due to an accident with Nightmare during the heavyweight consolation rumble.