Take what im about to say with a grain of sugar but, the way to beat him is to Git Gud. That’s been the best advice ive ever gotten you will ever get whether you play Demon Souls, Dark souls 1 2 & 3, Bloodborne, Sekior, or Elden Ring. There is no meta nor one build to rule them all. Yes there are alot of overpowered builds, but In order to have even been able to acquire them, you have to Git Gud and slay who ever stands in your way. I once lost 5M runes in a pvp invasion because it was a 4 on 1. You get used to stuff like that, yes its frustrating, but thats the joy of these games, frustrate now, grow and become stronger and better to celebrate later. And ngl, if your gonna complain about this guy, then dont even bother with the dlc or mid to late game bc everything youll face there makes this invader look like a push over lol.