You can get Compex Root from the Mimicron boss at the end of the Tipping Point Order bunker to the southeast of Idolator's Noose, Fadefields. In fact, it's near the coast just east of Sol's Fortress ...

There are some pretty interesting legendary items in Borderlands 4. For instance, the Noisy Cricket fires a sonic-style projectile that can launch enemies and even launch yourself, making it very fun ...