This article covers multiplayer co-op features in LET IT DIE: INFERNO (LID). It explains how LID's multiplayer systems work, and how to co-op with friends in LID.
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Is Co-op or Multiplayer Possible?
Co-op Exclusive PvE Duo Added

In Season 2, which began on March 9, 2026 (PST), a new co-op-exclusive mode, "PvE Duo," was added. In this mode, you can invite a friend and explore together.
KIL Matches Held Periodically

A limited-time mode called 'KIL Matches,' where two teams of four battle each other, is held periodically. During the event, you can join from the 'KIL Terminal' located next to the Training Area in your Base. Your profile’s assigned Team will be used for KIL Matches.
View Upcoming Matches at the Terminal

You can check the event period for the next KIL Matches at the KIL Terminal located beside the Training Area in your Base.
Timothy