Implicating mind_flayer → dungeons_and_dragons
Link to implication

Reason:

The Mind Flayer, or Illithid, is part of D&D's product identity, and was made for the game.

Other Product Identity Implications

• beholder -> dungeons_and_dragons
• displacer_beast -> dungeons_and_dragons
• githyanki -> dungeons_and_dragons
• githzerai -> dungeons_and_dragons
• slaad -> dungeons_and_dragons
• umber_hulk -> dungeons_and_dragons
• yuan-ti -> dungeons_and_dragons

EDIT: The tag implication mind_flayer -> dungeons_and_dragons (forum #273004) has been rejected by @NotMeNotYou.

Mind Flayers have been used in other media too though, like Final Fantasy, as one example.

All violations of WotC copyright. Beholders appear in other things too, but some MMORPG had to rename theirs because of legal threats from WotC. This copyright is why Pathfinder doesn't have illithids or beholders, or anything else I listed in the op.

We have Drider implicated, anyways, even though Driders aren't product identity and are way more widespread than any of these (there are other cases are also already implicated to D&D).

The tag implication mind_flayer -> dungeons_and_dragons (forum #273004) has been rejected by @NotMeNotYou.