You get 4 rune sockets in PoE2 by adding sockets to the weapon with Artificer’s Orbs and, if needed, pushing past the usual limit with a Vaal Orb. Normally, most weapons cap at 2 rune sockets, so 4 is the rare overcap case.

How it works

  1. Find a weapon that can take sockets.
  2. Use Artificer’s Orbs to add sockets up to the normal limit.
  1. If you want to go beyond that limit, use a Vaal Orb , which can sometimes add an extra socket, but it can also brick the item.

Important catch

  • Runes are not removable once placed.
  • You can usually replace a rune by putting a new one into the same socket, but the old one is destroyed.
  • Because of that, it’s best to use this on a weapon you plan to keep for a while.

Practical advice

  • Start with a good rare weapon.
  • Add sockets first with Artificer’s Orbs.
  • Only gamble with a Vaal Orb if the weapon is already worth the risk.

TL;DR: To get 4 runes on one weapon in PoE2, you usually need a normal socketed weapon, then use Artificer’s Orbs, and finally a lucky Vaal Orb to exceed the standard socket cap.