ThatOneSMP is a short Minecraft Java SMP that runs for 10 days. It is mainly focused on PVP so you should expect fights and rivalries.
The server starts tonight on the 13th at 6pm EDT. It is a small group right now and the server stays up each night during the event.
It is a Java Paper server on version 1.21.11 and it also allows cracked players. They prefer people around ages 14 to 16. The server address is shared in their Discord.
