Thundering Artefact

Thundering Artefact – Unlocks Archylte Steppe ??? AF

Go as far east as the map will go until you encounter a group of Miniflans in the Overgrown Forest area. Defeat them in battle to earn the Thundering Artefact.

This artefact can only be used on the Base of Crystal Time Gate – which is found at the north-most point of the map. This gate will open the Archylte Steppe ??? AF time period in the Historia Crux, which is by far the largest area in Final Fantasy XIII-2.

You must also travel to Archylte Steppe ??? AF before fighting Mutantomato. Head there now before attempting the rest of the fragments and artefacts in Sunleth Waterscape 300 AF.