This server is ultra hardcore style so you do not heal naturally and if you die you are out. It has been running this way since Aug 09 2019 and the whole point is staying alive as long as you can.
There is a score system that keeps things competitive. You get 1 point per minute alive and 1 point per experience point you earn. Stuff like killing a skeleton gives points and big wins like killing the dragon give a massive score.
When you join you start in the Spawn Ship until you are ready to enter the world. You can hold a bone block to see the current top scoring players.
If you die you can try to earn a revive back to the Overworld by winning the weekly Sunday competition. Sundays at 11CT there is also a special team competition. Prizes can include a revive on the persistent ultra hardcore world or an in game advancement shout out.
The server also uses an Apocalypse DataPack with extra dangerous mob stuff. Zombies can turn players into zombies. Some skeletons get enhanced. Bats can bite and morph into an illusionist. Spiders can spin webs. There are ox heads defending pastures plus the lich and other threats like Herobrine and Medusa in the Nether.
Rules are simple. Play fair and friendly and do not use client side mods that give unfair advantages. No hacking and no xray packs or hacked clients.

