Queenbreakers Bow would need a Range reduction if it was special. Linear fusion rifles like Arbalest proves how nutty their Aim Assist is.
Skyburners Oath just needs better damage and an increase to RoF
DARCI is a powerhouse but if it were a special weapon it would lose this aspect. Add this: precision hits on a target that has been scanned will increase precision damage for a short time.
Cold heart should have the means to swap in-game between Arc and Stasis like Hard Light