Currently there is no level5, when you stat you go from lvl4 to lvl6, as far as i can tell(hard with hp reroll on stating) you only get lvl5 hit points as well.
I'm assuming something still buggy with char files as just after ascis were put in stating you started with 4 or 5 hps
PC corpses decay quickly(at least newbies, not tested on any others)