What to do with blue essence?

I've got 1.7k blue essence and 20k ip. should I save it up till pre season or should I get my lvl 6 and 7 masteries?

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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