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 Tramennis Erf-b2-p060. In fact, Adam Antium almost explicitly calls them flying siege LIAB Text 36
Real World References
Sonic Drive In is a fast food chain in the south-western United States with some franchises in the south-central USA and the south-east USA. It is typically has no indoor seating, with cars parking around a central kitchen, food is delivered to cars which park under a covered awning, commonly by servers wearing roller skates.