Outsider Effect

Overview
Outsider Effect is event and/or condition where characters or somethings from another fiction enter the Genshinverse. These characters from another fiction that outside the Genshinverse are called as Outsiders. Outsider Effect occurred because there are connections between other fiction and Genshinverse that occurs in any form, such as by interdimensional portals or other anomalies.

History
The Outsider Effect was first mentioned in The New Adventure (Meeting The Outsiders, The Formation of World Guardian Corps, & The Multiverse Adventure) arc, with Kratos from God of War as the first outsider that enter the Genshinverse through the interdimensional portal that connect Genshin World and God of War World. It is not explained exactly how the portal can appear, but it seems that this event also succeeded in taking a casualty, namely Archon Pyro who was killed by Kratos in this Outsider Effect event and became the first casualty of the Outsider Effect event.