【Atelier Resleriana: Forgotten Alchemy and the Polar Night Liberator】I synthesized 300 times and obtained SSR equipment with Trait Level V/V, but only received Lodestar Gems×3,000.

If you have achieved the both conditions of the 1st prize (obtaining SSR equipment items with Trait Level V/V by Synthesize) and the
"Synthesize! Synthe-prize!" (synthesizing 300 or more times), the 1st prize will be applied.

For details, please refer to the in-game announcement “Synthesize! Synthe-prize! Campaign! (the target month)"