Sole Appearance: Episode 25 - "Ideon's Counterattack"
The Dero Zan was dispatched by Harulu to aid Daram over Kyaral, carrying a compliment of two Zigg Mack heavy mobile mecha. The type was advanced for a cruiser, and like the Gabro Zan could split into two sections for the front to act as a fighter.
However, the Dero Zan was lost almost immediately when Daram's ships were jumped by a combined assault led by the Ideon.
Disclaimer: there might be ships of the same type in Be Invoked as most Buff Clan designs do appear in Doba's armada, but if there were I didn't notice...