The Corrosion effect is detrimental to Genshin Impact players in the Three Realms Gateway Offering event, so it's vital to reduce it as much as possible.
Travelers should understand that increasing the Bokuso Box's level is instrumental in fighting off this vile effect. Each level-up will increase the Bokuso Box's Corrosion Resistance. Here is a quick list of all the level-ups and the relevant Corrosion Resistance:
Players will need to collect Light Realm Sigils in order to upgrade their Bokuso Box. If the player opens up their map in the Three Realms Gateway Offering event, they should see various spots on the world marked with "Corrosion Intensity" followed by a number.
Ideally, the player will have upgraded the Bokuso Box to a level that gives them a high enough resistance to that area.
This screenshot serves as a basic example of how the Bokuso Box's resistance to Corrosion works:
The highest intensity goes up to 118, which a Level 15 Bokuso Box can nullify. Upgrading the Bokuso Box can be done near the center of the map at the Statue of the Vassals.
Light Realm Sigils play a crucial role in the Three Realms Gateway Offering event. They're required to upgrade the Bokuso Box, which means that Genshin Impact players need a way to farm this item.
One won't find them randomly in the wild, but they are available through chests, challenges, waypoints, and the event's rewards.
A Level 2 Bokuso Box can scout nearby treasure chests and challenges, with higher levels improving the range of this ability. Travelers should know that there are more obtainable Light Realm Sigils than what's necessary to max out their Bokuso Box in Genshin Impact.
This effect can reduce the general effectiveness of a player's unit while it's active. It can
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