Governing the element Wind, Silwest is a very carefree, confident Mana. She is also very noticeable due to a whirl of wind at her feet, and is a powerful Mana. She helps in synthesizing wind-themed items and weapons, helping Felt in synthesizing most of the party members' weapon.
In Atelier Iris 2, there is a Wind Mana named Coco who works at Melona's shop.
Silwest is one of so many Manas that lost her Holy Ground, the Weathervane Hill. After Felt repaired the Workshop in the depths of Tatalia Ruins, he told Viese that the Weathervane Hill should be restored. Viese had obtained the recipe for Viese's Charm, and was confused on how to find the primary material needed, the Hexi Glass. She then went to Weathervane Hill, and met Silwest. The Mana was first uninterested in Viese, however after Viese told her that she wanted to help Felt, which Silwest misinterpreted as her husband, Silwest immediately agreed to help her. The player is bestowed with the Wind Gem afterwards.