Grover's ultimate does not make him CC immune but stunning him will not cancel the aoe heal. Displacement heavy comps are very powerful against him since they can keep him away from his team and reduce his healing.
As Yagorath, you are a prime target for Ruckus to use his Hexa Fire on you, if you suspect he is going to use it soon try to preserve Harden and use it when he activates it to massively reduce the high Damage it deals.
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