Now, correct me or not if this has been retconned, but with our previous knowledge of the Vex, the base units are regarded as mining frames. We hear about warrior/combat frames invading Oryx’s throne room because of Crota, and being able to handle Ascendant Hive three to one.
Are Wyverns also considered mining frames? Or are they the start of the combat frames we will (hopefully) be seeing in the future?
Wyverns are the first combat built Vex we've encountered, hence their overwhelming firepower. They were deployed on Europa because of Clovis actively kidnapping Vex units and because instead of a simple conversion their inclusion was as part of an invasion against a militarised force that had been studying them.