There are almost a hundred different champions all with ultimate abilities but theirs only a few that are majorly game changing, can anyone please name them all or at least the heroes names?
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Amumu, Ashe, Cassiopeia (if she lands the stun), Galio, Karthus, Kennen, Morgana, Shen, Skarner, Urgot, Vladimir.
Those are the most gamechanging ultimates in the game imo. It has to be either a good initiation ability (Ashe, Urgot, etc) or bring some other utility like an aoe stun, dmg buff from Vladimir or Shen's global ult which helps other lanes win.