Cooldown Reduction in Diablo 4 is a Utility affix, not an offensive or defensive one. It can appear on gear like amulets, helms, gloves, and some weapons/off-hands, and it reduces skill cooldowns so you can use abilities more often.

What it does

  • It lowers the time before a skill can be used again.
  • It is especially strong for builds that rely on ultimates, shouts, or other high-impact skills.
  • Community discussion also notes it can be pretty rare to find in some slots, so players often prioritize it when they see it.

Simple answer

If you’re asking “what kind of affix is it?”, the best label is: Utility affix.

TL;DR: Cooldown Reduction is a Utility affix in Diablo 4 and is one of the most valuable affixes for many builds.