Her passive grants everyone 3% movespeed. If zilean's speedboost grants assists, then why doesn't janna's passive grant assists?

You actually do something to give the speed boost. Janna's is completely passive.

why dont i get assists for being near a kill after buying an aegis?

why dont any of the team wide passives grant assists?

that copy name

Passives do not grant assist unless they have some sort of interaction with it.

Like Kog'Maw's or Zyra's. You can to run/aim.

Or Passive's like Ashe's which require an auto attack.

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LEMME JOIN CLG

I CN SUPPORT 4 U BABE!!!!!!!!!!!!!!!!!!!