Eldritch Tokens are a token used while playing Eldritch Horror. They are typically used to mark specific locations during a Mystery to show where the players need to go in order to complete certain objectives. Some Mysteries will also place Eldritch Tokens on the Mystery card itself, completing the Mystery once a certain number of tokens have been placed.
Eldritch Tokens are also typically placed on Tasks that may be invoked multiple times in order to signify progress. Corruption Condition and Nyarlathotep Ancient One also use Edlritch Tokens as mechanics.