When was the last time a DoT effect was introduced to the game?

Have riot stated why we see no more dots and only burst damage spells for so long? Am I just blanking out on a dot that was released recently?

We're testing a new feature that gives the option to view discussion comments in chronological order. Some testers have pointed out situations in which they feel a linear view could be helpful, so we'd like see how you guys make use of it.

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