Use Script

bonus bIgnoreDefClass,Class_Normal;
bonus bHPrecovRate,-100;
bonus2 bHPLossRate,666,10000;

Unequip Script

if (Hp <= 999 && !getmapflag(strcharinfo(3),mf_pvp) && !getmapflag(strcharinfo(3),mf_pvp_noparty) && !getmapflag(strcharinfo(3),mf_pvp_noguild)) {
   heal (1-Hp),0;
}
else {
   heal -999,0;
}