Generally denotes master-level proficiency. At this stage, the glassmaker is not just following a mold but managing extreme thermal gradients and complex chemical compositions. AV 2 (Advanced Version 2):
It looks like you’re asking for a report based on the phrase: iv av 2 advanced trial glass atelier work
While the specific phrase "iv av 2 advanced trial glass atelier work" Generally denotes master-level proficiency
Most glassblowers made vases. Elara made veins. iv av 2 advanced trial glass atelier work