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Depending on your rig and guitar, this may be totally unnecessary and kill your tone. If you're happy with your djent-style riffs without either of these pedals, it's safe to leave out of your chain.

While it's not necessary to play a djent riff, the specific tone of the djent riff is interesting and unique, because it goes both high and low at the same time, even though it's on a single note. Partially, this is a virtue of the low tuning and a result of the microtones and harmony of the guitar, but you can emphasize this effect by using a chorus or octave unit in your pedal chain, with the volume turned quite low.