When will mastery cores (namely carbonadium ones) go on sale again?

Decipher

Just wondering as I'm considering grinding out arenas for suicide masteries. Wondering how much time I have left.

winterthur

I gave up waiting. Bought 3 carb cores, 6 stony and placed the last 3 mastery points in deep wounds and assassin.

rivet

Don’t think I have seen any discount in the whole 2020 year, i mean for unit offer, not sure about money offer, I think going with gifting event is your best value