Delirium on Waystones in Path of Exile 2 generally makes the area harder and more rewarding, with reported benefits like more monster pack size and tougher enemies, but it also adds danger.

What it gives

  • More monsters in the area.
  • Better rewards from the Delirium encounter.
  • Increased difficulty, including stronger enemy defenses such as elemental resistances.

Practical meaning

In plain terms, a Delirium Waystone is a risk-for-reward setup: you get denser, more lucrative fights, but the map becomes noticeably more dangerous.

Extra note

Some PoE 2 guides also mention that Waystones can interact with Delirium through Distilled Emotions / instilling mechanics, with up to three of the same type affecting a Waystone.

TL;DR: Delirium on a Waystone boosts monster density and rewards, but also makes the content significantly harder.