Herald Buff is way too strong for how long it lasts
Seriously, what is the point of having a 20 minute buff for one team, for whatever reason that team gets the buff, the champion that has rift herald is so much more OP than the person he is leaning against, it is almost an automatic snowball. I suggest a couple of changes
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Make Rift Herald harder to kill (take away the true damage from behind, decrease the health just a tad) so that the enemy team has a bit more time to come and counter the team that is trying to take it.
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Make the actual buff weaker or different, I feel like its just a free Echos item without the AoE for 20 minutes.