Tablist Banner
The TabListBannerPacket is a client-bound packet that allows servers to add a custom banner above the player list.
Important Note
The aspect ratio of the image must be 5:1 and the recommended resolution is 1280x256 pixels.

Sending the Packet
The packet can either be sent via the LabyModPlayer object of the player, or directly via the LabyModProtocol.
The value can either be a URL to the image or null to unset the banner.
Via LabyModPlayer
// Get the LabyModPlayer
LabyModPlayer labyModPlayer = LabyModProtocolService.get().getPlayer(uniqueId);
// Send the tab list banner
labyModPlayer.sendTabListBanner("https://example.com/banner.png");
Via the LabyModProtocol
// Get the LabyModProtocol
LabyModProtocol labyModProtocol = LabyModProtocolService.get().labyModProtocol();
// Send the packet
labyModProtocol.sendPacket(uniqueId, new TabListBannerPacket("https://example.com/banner.png"));