The Orange Robe Crew

The Orange Robe Crew are a group of 7 nefarious individuals who seem to have some connection to both the Cult of Orcus and the Cult of Nerull. They have been facing off against the group in one way or another since the very beginning, and seem to be orchestrating events from afar.

The group is unable to confront them directly, because Desmond can perform a time lock spell that locks them into a plane, leaving them unable to move.

The Orange Robe Crew has also shown that once they have been killed, they can be resurrected as an undead version of themselves, so they presumably need to be killed twice.

They are:

Desmond, a gnome male that seems to be the leader

Ustalar, an undead Human male who the group killed once in Thalstead

Sivath, an undead Dragonborn male who the group let the town of Dragus kill

Zadicus, a shapeshifting Goliath male, who the group squared off with near Solstice

Arkilius, a Tiefling male who the group found a note of just before the defense of Adastra

Sakuja, an Orc female who the group saw during the siege of the L'Boontian mansion

Carmina, a Drow female who the group slipped by just before confronting the Avatar of Orcus under Miradore