Presence

Presence was planned to be the twelfth of the Twelve, but was effectively killed, corrupted, and absorbed by Krk while Dust was still forming Presence out if itself. The resulting fallout and continued fighting between Krk and the rest of the Twelve led to the events described as Fall of Presence(name subject to change).

"Presence" is actually just the name given to the entity, unlike those of the other Twelve, who each chose their own names.