Delete Keystone masteries
Tanks doing too much damages in early S6 and not easy to bully in early game ? Grasp of the Undying.
Assassins / skirmishers not supposed to be built tanky but they can thanks to absurd base damages through AA ? Fervor of Battle.
Bullshit reworked Graves toplane healing himself better than Vlad or Aatrox ? Warlord's Bloodlust (pre-nerf).
The whole fiasco pre-season S6 Tryndamere / Yasuo / Jax ? Warlord's Bloodlust (pre-reworked) and Fervor of Battle (getting stacks on monsters / minions).
Bruiser / Tank Master Yi ? Fervor of Battle.
Keystone masteries give too much base damages / sustain. Ekko tank had shitty damages back in S5. He was picked as a jungler for his utility and because he was very disruptive. Not for his damages / tank ratio at all.
Delete keystone masteries. Problems solved.