Training Items are used to level up your characters, increasing their stats. They come in various rarities and provide different amounts of EXP. Common training items include 'Gravity Chamber' and 'Weights'. The best way to farm training items is through specific Growth Events like 'Training in the Clouds' or by completing daily missions. Zeni is the in-game currency used for various purposes, including training characters, awakening them, and purchasing items from the Baba Shop. The 'Hercule's World Tournament' event is the best source of Zeni, offering millions per run. Always keep a healthy stock of both training items and Zeni, as character development can be quite expensive.
