I would like to find a hack I can use on the private server. Preferably like a 1 hit or max HP always. I don't have the skills needed to make one and I can't seem to find one.
it is not necessary on private server, and it just don't exist at all.
Private server work the same way official ones: near all interresting values are generated and calculated server-side.
The only hacks working with game client, player-side, are only graphic hacks.