The server has a system called KeepInventory Lives (hereinafter referred to as KI).

As long as the player has KI lives, items and experience will not drop upon death (same as with turned on gamerule KeepInventory). The number of KI lives can be determined using the command /ki.Their number is also displayed when connecting to the server, after death, and when purchasing KI lives. Each player initially has 10 KI lives.

You can acquire or upgrade KI live at the spawn by the Angel statue for the price of one diamond. Just right-click on the appropriate sign

The existing KI live can also be upgraded for one diamond. The improved KI live works similar to a totem. The only difference from the totem is that the improved KI live does not take up space in the inventory. So, if desired and with the required number of diamonds, you can almost become an invincible machine.