Mythe
Scénario

Easy / Standard

: -1 for each Brood of Yog-Sothoth in play.

: Reveal another token. If you fail this test, take 1 horror.

: 0. You must either remove all clue tokens from a Brood of Yog-Sothoth in play, or this token's modifier is -4 instead.

: -3. If this token is revealed during an attack or evasion attempt against a Brood of Yog-Sothoth, it immediately attacks you.

Aux Frontières du Visible #236. Undimensioned and Unseen #1.
Undimensioned and Unseen

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Scénario

Hard / Expert

: -2 for each Brood of Yog-Sothoth in play.

: Reveal another token. If you fail this test, take 1 horror and 1 damage.

: 0. You must either remove all clue tokens from a Brood of Yog-Sothoth in play, or this test automatically fails.

: -5. If this token is revealed during an attack or evasion attempt against a Brood of Yog-Sothoth, it immediately attacks you.

Undimensioned and Unseen
FAQs (taken from the official FAQ or FFG's responses to the official rules question form)
  • Automatic Success/Failure: Some card effects make an investigator automatically succeed or automatically fail a skill test. If this occurs, depending on the timing of such an effect, certain steps of the skill test may be skipped in their entirety.
    • If it is known that an investigator automatically succeeds or fails at a skill test before Step 3 (“Reveal Chaos Token”) occurs, that step is skipped, along with Step 4. No chaos token(s) are revealed from the chaos bag, and the investigator immediately moves to Step 5. All other steps of the skill test resolve as normal.
    • If a chaos token effect causes an investigator to automatically succeed or fail at a skill test, continue with Steps 3 and 4, as normal. - FAQ, v.1.7, March 2020
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Reviews

In the case of the token, if there are currently no clue tokens on any Brood of Yog-Sothoth, one cannot choose the first option and consider the effect of the doom token done ; in this case one is compelled to choose the alternative (-4 in easy/normal, auto-fail in hard/expert).

Ruling by Matthew Newman here) :

If you are instructed that you “must” choose among multiple options, you are compelled to choose an option that has the potential to change the game state (Rules Reference, “Must,” page 16). In this case, if there are no clues on any Brood of Yog-Sothoths in play, you cannot choose that option, and must instead change the token’s modifier to –4.
manur · 3
There are only 38 cards in this encounter set, including the scenario card itself. Is the set # printed in the corner, i.e., 1/39 a typo then? — Krzysztopher · 1
Will spawn of yog attack the player when a player draws the -3/-5 symboli during an attack if it already exhausted? — Narska · 1