You can't be Charmed or Frightened by elementals and fey. Disease and poison also no longer affect you.
Unnatural Blot is a hostile Countermeasure Aberration character in Baldur's Gate 3 who may appear during the final battle Atop the Netherbrain if the player sides with the Emperor. It will appear if a druid is present in the party.
Conjure a flaming Scimitar in your hand that deals 3d6Fire damage. It sheds a bright light in a 3 m / 10 ft radius and a dim light in a 6 m / 20 ft radius.