Here's how Krennic visits Darth Vader, Diesel 10, and his buddies in Hiatt Grey's Engines' Adventures of Rogue One: A Star Wars Story.
[Then we see Krennic's ship flying in Mustafar, and then it flies towards a castle and lands. Then a hooded figure goes to a room where doors open and we see a tube filled with water and royal guards beside it. And with them are Diesel 10, Splatter, Dodge, Queen Chrysalis, Trixie Lulamoon, Diamond Tiara, and Silver Spoon. And he bows to them]
Vaneé: My Lord, Director Krennic has arrived.
[Then inside the tube we see a strange figure. We hear machine noises as the water drains, revealing a burnt Anakin Skywalker; who is still recovering from his injuries. Then in a room, we see Krennic standing there as the doors open with some mist, and out walking is Darth Vader. And with him are: Diesel 10, Splatter, Dodge, Queen Chrysalis, Trixie Lulamoon, Diamond Tiara, and Silver Spoon]
Darth Vader: Director Krennic.
Krennic: Lord Vader. Diesel 10, Splatter, Dodge, Queen Chrysalis, Trixie Lulamoon, Diamond Tiara, and Silver Spoon.
Diesel 10: Hello, Krennic! It was unexpected for you to arrive.
Darth Vader: You seem unsettled.
Krennic: No. Just pressed for time. They're a great many things to attend to.
Darth Vader: My apologies.
Queen Chrysalis: But, you do have some things to explain.
Krennic: I've delivered the weapon the Emperor requested, I deserve an audience, to make certain he understands its remarkable! Potential.
Trixie: Don't be an idiot. It has powers to create problems, and it has been confirmed! A city destroyed, and an Imperial facility openly attacked!
Krennic: It was Governor Tarkin who suggested the test.
Darth Vader: You were not summoned here to grovel, Director Krennic.
Krennic: No, it's....
Darth Vader: There is no Death Star. The Senate has been informed that Jedha was destroyed in a mining disaster.
Krennic: Yes, my lord.
Diesel 10: And we expect you to not rest until you can assure the Emperor, that Galen Erso has not compromised this weapon in any way. [snaps pinchy]
[They turn and walk away]
Krennic: So I'm still in command? [they stop in their tracks] You'll speak to the Emperor about....
[But then Darth Vader Force chokes Krennic, as his head twitches, and his left hand grabs his throat and lands on the floor with his knees]
Darth Vader: Be careful not to choke on your aspirations, Director. [releases him as Krennic catches his breath]
Splatter: Now get out of our sight.
Dodge: Yeah, you worthless waste of time.
Diamond Tiara and Silver Spoon: See ya!
[As they go back to their room, Krennic looks at them as the doors shut]