What do Skarner's Crystals do in patch 5.16?

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When playing Skarner in the new patch there are crystals all over the jungle which can be captured by him, or reset by the enemy, what do the crystals do for the team Skarner is on, and do the crystals do anything for the opposite team?
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Why NO ONE Plays: Skarner (League of Legends)
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