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It was Gnoll Packlord that did this to me
(ttrpg.network)
4e Pack Lord: Whenever heroes kill one of its allies it can force one of them to hit themselves, it can move multiple allies forwards, grant them extra attacks
5e Pack Lord: Just regular Gnoll but can recharge one ally's Rampage.
Compared to 3.5 it was a breeze to teach to new players.