Mourn in Predecessor are countered by: Rampage, Boris, Grux. Item choices against Mourn include: Tainted Guard, Tainted Bastion, Tainted Scepter, Tainted Rounds, Tainted Blade, Tainted Totem.
Roles: Support
Tier: S+
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Heroes counter Mourn
Items counter Mourn
Tips counter Mourn
CC Mourn from a distance to keep him from closing in on you. Poke and kite Mourn from a distance.
Don’t go alone because Mourn can easily kill you when you are weak heroes.
Build anti-healing items to counter Mourn.
Poke and harass Mourn before a fight. He’ll take a lot of damage before the fight starts.
Prioritize choosing heroes that are mobile, have CC, and can easily dodge Mourn.
Read more: Yin counter Predecessor