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If you use an Android device, instead of uninstalling the app, reset the app data for WOTV. This will allow you to skip uninstalling and re-downloading to save time.
Occasionally the color of a crystal will upgrade to Gold or Rainbow.
If the crystal is Rainbow colored, a UR unit or vision card is guaranteed.
If the crystal is Gold colored, a MR unit or vision card is guaranteed.
Note 1: This is a rate for Rare Summon (Rare Gacha).
Note 2: Units sometimes get rate-up.
Once you have 1 or 2 UR units, you may want to stop re-rolling and start playing the game. Each UR unit has different specialties and can work well.
UR Units & Tier List
MR Units & MR Tier List
Unit/Vision Card Release Schedule
UR Vision Cards
SR Units & SR Tier List