D&D 5E - Minor illusion for advantage to attack?

At a minimum, there's no reason why you'd get both advantage to attack(s) and give disadvantage to others' attack(s). Ie, it's a one use and now it's obvious it's an illusion and can be seen through.

As a general guideline, more effective than (another more specific cantrip) is probably your warning that you're doing it wrong :) That said, advantage for an action is a pretty tried and true metric. Ranged "Help" via a cantrip? Sure, whatever.

At a minimum, there's no reason why you'd get both advantage to attack(s) and give disadvantage to others' attack(s). Ie, it's a one use and now it's obvious it's an illusion and can be seen through.

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