Vanilla protection for 100 block radius around x0 z0 with a few features.
Features:
command book, use /trigger book set 1
Kit (15 minute cooldown)
Spawn (you have to take damage at some point before you can use this, but you have to be at full health to use.)
No pvp in spawn
May have bugs
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 How to use:
Place command in command block and power from the side(do not power with button on top)
//for best results do /setworldspawn at 0 0 and run command at y=64 within 100 blocks 0 64 0