Source: Tal'Dorei Campaign Setting

Wondrous item, legendary (requires attunement by a non-good character)

Upon wearing this circlet of gnarled onyx, black barbs dig into your head, imparting power as it twists your appearance to amuse the Spider Queen. While wearing this circlet, your Charisma score decreases by 2. You also have advantage on initiative rolls.

When you make an attack roll, you can use your reaction to gain a +5 bonus to the roll. You make this choice after you see the roll, but before the DM says whether the attack hits or misses. You cannot use this ability again until you finish a short or long rest.

Awakened. When a character awakens the Circlet of Barbed Vision, apply the following changes to the item’s traits:

  • You also gain resistance to poison damage, and gain immunity to the poisoned condition.
  • Your ability to gain a bonus to an attack roll can be used twice between rests.

Exalted. When a character exalts the Circlet of Barbed Vision, apply the following changes to the item’s traits:

  • You gain immunity to poison damage in addition to the poisoned condition.
  • You can also see invisible creatures and objects.
  • Your ability to gain a bonus to an attack roll can be used three times between rests.