Can I Kill an Immortal Player?

What if there was a Minecraft Server where you could steal someone’s hearts by ending them. Can I Kill an Immortal Player? Like ParrotX2 and his School’s Minecraft Server / School SMP Series where he Started a War or Ended a War. Not AJTHEBOLD / TommyInnit / or any other Dream SMP member. This is a new and original Minecraft idea / challenge where you can steal SMP Minecraft players’ lives. Survival is harder than Hardcore Minecraft because PVP is a thing. Edited by @jackalonyt Twitch Channel ✔ DISCORD SERVER ✔ Twitter ✔ #LifeSteal