Astral Shards

The Starsphere Shards are a collection of twelve fragments of the Starsphere. Each shard corresponds to one of the twelve constellations and they modify the Growth Rates of the character holding them. As of Fire Emblem: Shin Monshō no Nazo ~Hikari to Kage no Eiyū~, each shard gives stat boosts and can even exceed capped stats.

After Gotoh created the Starlight spell in Fire Emblem: Shadow Dragon, the impact shattered the Starsphere and its pieces flew all across the continent of Akaneia. Bishop Wendell was entrusted to recover all twelve shards, but he was captured by Akaneia's forces and his collection was ransacked. In the end, Wendell requests Marth to help him continue his quest.