Date: 24-Sep-2021
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During the event, complete the "Spectral Secrets" expedition commissions to earn Primogem rewards. Depending on which characters you dispatch, you can also earn rewards such as Sanctifying Unction, Talent Level-Up Materials, Character EXP Materials, and even bonus rewards.
〓Event Duration〓
Event Duration: 2021/09/19 10:00:00 – 2021/09/26 03:59:59
Reward Collection Time: 2021/09/19 10:00:00 – 2021/09/29 03:59:59
〓Eligibility〓
⚠ Adventure Rank 30 or above
⚠ Complete the Archon Quest "Ritou Escape Plan" and the "Floating Spirits — The Investigation Begins" quest given by Inazuma's Katheryne
〓Event Details〓
● During this event, Katheryne of the Adventurer's Guild will release seven investigative expedition commissions for "Spectral Secrets" each day, of which you can select four.
● One S-rank commission, two A-rank commissions, and four B-rank commissions will refresh each day. S-Rank expedition commissions require you to complete the open-world challenge "Preliminary Investigation" first, after which you can initiate the expedition.
● For each commission, Travelers may enlist one character belonging to a friend on their friend list for every expedition in "Spectral Secrets" as a supporting character. Supporting characters will increase the chance of obtaining additional rewards. Supporting characters may be selected from any of the characters in a friend's Character Showcase.
● Travelers can recall dispatched characters. Recalled characters will not obtain rewards, but the number of dispatches consumed will be restored.
● Characters cannot be simultaneously dispatched to both regular expeditions and "Spectral Secrets" event expeditions.
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Source: https://www.hoyolab.com/article/780934