His company

You decide to target his company. You teleport downtown to the Riley Industries building, and using your magic rings, it's easy to bypass security to get all the way up to Bruno's CEO office on the top floor. There's only one person on the floor, and she's sitting outside his office. It must be his assistant, Helen, whom you had spoken with previously, but she's not exactly what you pictured. Instead of a young woman out of college, Helen looks to be in her mid-30s, well dressed in her power suit, dark hair tied in a bun, and thick black glasses. While she's an assistant, it looks like everything she's wearing and owns is designer brand. Bruno must pay her well.

"Who are you?!?" she asks when she sees you exit the elevator.

"I'm John Colins."

It takes her a few seconds to register your name and she hastily picks up the phone, either to call security or Bruno. You can't have that, so you activate your mind control ring and command her to stop. She does, and looks terrified.

"Helen, is it?" you ask. She nods.

"What do you know about me?"

"...Everything."

"Everything? Elaborate."

"You have 5 magic rings that give you abilities of teleportation, time control, invisibility, mind control, and super strength."

You're surprised that she knows about your rings, and that Bruno shared the information with her.

"Bruno told you?"

"Yes."

"Why?"

"He tells me everything. I manage his life and in return he rewards me nicely."

"I see... Okay, this is what I want you to do. Call the board members of Riley Industries in right now. Say it's an emergency and being done at Bruno's direction."

Helen does as you say, and in a little bit over a hour, you're sitting at the head of a conference table in the boardroom with the board members. Helen is standing next to you at attention and at your beck and call. You still haven't deactivated your mind control ring. The members are puzzled to see you, but they quiet down when you raise your hand. You can't be bothered with the pretense so you just launch into business.

"Nobody needs to speak. You all just listen to me and do as I say. Yes? Nod." Everyone in the room nods.

"Good. First thing, all in favor of voting Bruno out of the company, raise your hand. Raise your hands." Everyone raises their hands.

"Great. Next, all in favor of naming me, John Colins, CEO, raise your hand. Raise your hands." Everyone raises their hands. You smile. This is too easy.

"Does the plane Bruno flies on belong to the company?" you ask Helen. She says yes and you tell the board to call the plane home so that Bruno is left stranded in Shanghai. You're sure he'll still be able to make it back, but it'll be a big delay. You then proceed to have the board remove Bruno from everything related to his company and transferred to you. He probably still has his personal riches, but this will deal a big blow to him when he finds out what you did.

Satisfied with the first step of your retaliation plan, you consider what to do next.