I may be wrong about this assessment, but I believe this card is essentially a more punishing version of the Haunted basic weakness. They do almost the same thing, but The 13th Vision affects all investigators whereas Haunted only affects the bearer.
For example, if you need to pass a 3 test with an investigator who has a base of 3 and you draw a "0" token, both Haunted and The 13th Vision will cause you to fail the test - Haunted would do it because it lowered your stat by 1 (causing a failure) and The 13th Vision would do it because you needed your stat to be one higher than the test to succeed.
Having 2 weaknesses that do very similar things does add a sliver of consistenty to an otherwise difficult-to-predict basic weakness pool, so overall I am glad to see a card like this one show up. It might be tough to deal with both weaknesses in play at the same time, though!