Laguna di Gondolia has a total of five crossbow targets for the Luminary to shoot. It’s likely they’ll be the first ones you’ll be aware of since you’re bound to the skip the NPC who tells you about this whole sidequest in the Gallopolis Region and learning it from the one here instead. Luckily, they’re all fairly easy to find save for one.
1. On top of a rock right outside the passage leading to/from the Gallopolis Region.
2. On one of the platforms in the middle section of the area.
3. Hanging from a tree above one of the walkways in the middle section of the area.
4. Beneath the bridge in the far right section of the area leading to the Grotta della Fonte.
5. On a rock across the water near the path leading to the Grotta della Fonte.
Upon shooting all five targets, head back to only campsite in the area to receive four seeds of deftness.