Plugin usato sul mio server mc.angelicmc.com

per vederlo all'opera entrate e capirete la potenzialitá di questo script

Doesn't work.
2 reasons I can think of:

1) the variable set in the death event doesn't match the variable used in the respawn event:
Death Event: `{attackplusdeath.%victim's uuid%} `
Respawn Event: `{attackplus.%player's uuid%} `
no matchy!!

2) when I fix #1 I get "you were killed by <none>"
This is because your use of a local variable across 2 events

Clearly this script was not tested!
And before you go and say "I tested it, it works on my server", well... it doesn't... trust me!