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Laconia is a precious metal found on Dezoris. When mined, it comes in an unrefined state and is often called silver. Special refining techniques can increase the strength of the low quality silver, resulting in a form called hi-Laconia or just Laconia.
Both the silver and hi-Laconia forms are used to create weapons and armor. Many of the most powerful equipment items in Phantasy Star games are Laconia items. Laconia is often shorted to "Laco" in the names of such items.
In many cases, Laconia items have additional powers or special properties. Lashiec was said to have been afraid of a holy power residing in weapons made from Laconia.