Pristine Vulpite

The item that turns a Veilwyn into a Solwyn

Pristine Vulpite comes from the Lost Colony DLC for ARK: Survival Ascended. The ARK Wiki gives its description as "Feed this to a Veilwyn to transform it into a Solwyn." Feeding it to a Veilwyn whose Adventure! buff stands at 100% evolves that Veilwyn into a Solwyn.

Earning one from a wild Solwyn

You need a tamed Veilwyn active as your pet companion, and you have to find a wild Solwyn. Every wild Solwyn shows an emote, and your Veilwyn has to perform that same emote; each correct one raises the Solwyn's curiosity. When curiosity hits 100%, use the Solwyn to receive a Vulpite. The level of the Solwyn at the moment you claim it decides the item's quality.

Corrupted Vulpite and storage

Instead of feeding it, you can take it to a Bloodforge and reinforce it with a Red Element Shard, which yields Corrupted Vulpite. A Pristine Vulpite weighs 0.1 and does not stack. Our records list it on the Lost Colony map, and the wiki gives 77.5 as the version that added it.