MisterFish

TwinSession allows multiple connections from the same Minecraft account to a single server or world. Seamlessly manage multiple in-game tasks with different clients, all using one account, without disconnections or additional purchases.

Enable AFK mode without keeping your computer on. Use /offline to spawn a copy of your player. If your offline player dies, you'll die but still have time to retrieve your stuff. If the offline player survives, you'll inherit its gains upon return.