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"super effective against certain enemies" sounds like Weapon of X-Slaying or (in general) Achilles' Heel.
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See the supertrope Achilles' Heel for various types of specific weaknesses and exploitations thereof. (I'll go ahead and add that one to the list on the disambig page for posterity.)
Side note that the link seems gratuitous even if it were a real trope, the whole point of the Silver Bullet trope is that they're a stock method of killing supernatural creatures.
Edited by Scorpion451
Something being more damaging than usual, is not a trope, right?
Been clearing out Super Effective's wicks, as it's a disambig. Found this, and dunno what trope to swap it with.
There is no trope to swap it with, right?
Is there a trope for a material being more damaging to some creature, but not immediately lethal in and of itself?
Meh, scrubbing that wick, yeah.
Edited by Malady