EOServ log spells to errors.log, inside method "void ESF::Read(const std::string& filename)" at approximately line 311.

eodata_spells.cpp

static bool logHeader = false;
if (!logHeader) {
  Console::Err("ID,Name,Channel,\
Type,Target Restrict,Target,\
Cast Time,TP Cost,SP Cost,Heal,Min Dmg,Max Dmg,\
Accuracy");
  logHeader = true;
}
if (newdata.name != "eof") {
  Console::Err("%i,%s,%s,\
%i,%i,%i,\
%i,%i,%i,%i,%i,%i,\
%i",
    newdata.id, newdata.name.c_str(), newdata.shout.c_str(),
    newdata.type, newdata.target_restrict, newdata.target,
    newdata.cast_time, newdata.tp, newdata.sp, newdata.hp, newdata.mindam, newdata.maxdam,
    newdata.accuracy);
}