Atelier Iris 3: Grand Phantasm which was released in Japan as Atelier Iris: Grand Fantasm is a console role-playing game created by Japanese
developer Gust for the PlayStation 2. There is no real connection to Grand Phantasm's original storyline; it is unrelated to the previous two entries in the series.
This system is a departure from previous games in the series and allows players to undertake multiple tasks at once and to choose their own way through the game to an extent. As tasks are completed, the party gains guild points. Once enough guild points are gained for the rank, the next part of the main plotline follows, before more side-quests in the form of tasks are made available. When the party moves from the town to an alterworld to complete a task, a timer starts counting down. If the task is not completed before time runs out, the party is safely removed from the alterworld and must attempt the quest again.
UNLOCKABLES
Completion bonus
Successfully complete the game and save. Return to the title screen to access the "Extra" option. Select it to view various lists, listen to music, and hear the Japanese voice acting.
True ending
Successfully complete all quests to unlock the hidden "Truth in Darkness" quest at the board at the Guild. Complete the "Truth in Darkness" quest, then create the Shadow Gem by using the item synthesis on Ruby Prism (obtained from item synthesis on Aroma Material, Brilliant Stone, Dunkelhite and Dragon Tongue) and Broken Gem (obtained during the "Truth in Darkness" quest). Then, defeat the final Boss, Uroboros.
Check out the Elder boss fight in the video below: