First Appearance: TBFGK 56
A type of Dwagon.
Purple Dwagon's seem to be ideal for Siege as evidenced by their usage in the siege of Spacerock by Gobwin Knob where their Sonic attack easily blew off a set of large double doors and injured several Jetstone units behind it including Prince Tremmanis Erf-b2-p060
Real World References
Sonic Drive In is a fast food chain in the south-western United States with some franchises in south-central and south-east.