Note: The sound of this animation seems to be linked with the "Ambiental Sounds" setting in your game; the animation will be muted if you have this setting at 0 or muted.

Credits:

Voice by Sloppy Walrus: https://www.twitch.tv/sloppywalrusx

AI Gragas voice originaly published by Giisuka.

Disclaimer: Take in mind that Nexus Finishers are a new type of mod discovered recently, and given all the changes Riot makes to maps, I can't ensure they are stable. You can check if they cause any trouble by looking at replays (go to the moment the game ends and check the animation of the nexus being destroyed)