Why does katarina have 15% damage reduction

{{champion:121}} Damage reduction was removed because he is an assassin not a tank {{champion:55}} is an assassin but has 15% damage reduction on a 6 seconds cool down but potentially no cool down at all when in a team fight due to passive. The only champ that is allowed to be an assassin and tank is {{champion:64}} , riot pls nerf cat arena Maybe it could be her compensation for DFG
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