- "Ancient Arkeyan war machine."
- —Game description
Arkeyan Ultrons are machines that were left behind by the Arkeyans. A few of them are first encountered in Molekin Mine, and if disturbed, they will start attacking. Unlike the ones in Quicksilver Vault or Arkeyan Armory, the Arkeyan Ultrons in Molekin Mine do not have shields.
In Molekin Mine, the Arkeyan Ultrons are shown to be quite relentless as they will chase down the Skylanders to inflict damage no matter what if they run away.
- There is a Tech element Skystone based on the Arkeyan Ultron, with two barbs on each side.