A participial clause can modify the entire main clause. In this case, it adds extra information to the idea of the defeat of the Goombots, so a case can be made for a main clause modifier. But our grammarians who subscribe to more modern theories of syntactic analysis may have other ideas.
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twistedthistleThe phrase "marking the dawn of a new era of freedom on the planet Zoid." is, i believe, a participial phrase,It has the verb "mark" (marking), so it's better to say it's a (participial) clause.
twistedthistlewhich to my knowledge should act as an adjective.No, it doesn't have to act as an adjec