My Little Pony LVI:S Has Left the Playground!

[erikun]

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In my opinion, while the job could have been done by evil smoke alone, the fact that it is intelligent is what adds to the sense of tension in the episode, especially at the end. The fact that he doesn't have any development makes it so this doesn't add as much, but an intelligent force of nature is still worse than a normal (magical) one.

Season 3 episode 1+2 spoilers:

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It may have made the episode better. (Arguably: a force of nature can be plenty climatic, and Sombra did not act that intelligent.) However, that doesn't mean it made the character any better.

You could say that Sombra heightened the tension and suspense in the episode with his presence, but that doesn't make his character any less flat or unmotivated.