If a Spirit has no Presence on the Island but has not yet lost all tokens from their Presence Track, do players lose immediately, or only when there is no Presence in play at all?
Official Answer
Players lose immediately if any Spirit has no Presence left on the Island, regardless of how many Presence tokens remain on their Presence Track.
This is stated on page 13:
If any Spirit ever has no Presence left on the Island, the players immediately lose. A land can hold any number of Presence from any number of Spirits.
It does not matter if the Spirit still has tokens on their Presence Track; the loss condition is triggered by having no Presence on the Island itself.
Source: page 13.
Source: Core Rulebook (pp. 12, 13, 14, 3, 8)