Masked Greathelm can only chance into a unique helmet that shares the same base type , so the result depends on which unique Masked Greathelm exists in PoE2’s item pool. In practice, it does not turn into a random helmet; it rolls from the uniques tied to that exact base, or the item is destroyed if the chance fails.

For PoE2 chance orb behavior, the key rule is that the normal item must match the unique’s base type exactly, and advanced/expert variants do not count as the base version.

What that means for your item

  • Use a normal white Masked Greathelm.
  • It can only become a unique that is eligible on that base.
  • If no unique exists for that exact base, chance orb won’t give you a useful unique outcome.

Practical takeaway

If you’re trying to target-chance a specific unique, first confirm the exact base match; otherwise you’re mostly gambling on a low-probability hit.

If you want, I can help identify the exact unique outcomes for Masked Greathelm specifically.