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Given that it's sorta the defining feature of an Ahamkara, an opening with mindhax is a safe bet. Ahamkara constantly feed on desire and twist others to their will, stringing them along in their scheme's, making them kill themselves, or whatever the ahamkara wants. Even an ahamkara corpse can mindhax. Riven is unique in also possessing the same Taken power tha Oryx, the Taken King had, though nowhere near as good as him, which further bolsters the mind stuff since worse come to worst it can call upon The Darkness directly as Oryx does.
Now, as for Riven's potency, to some degree it was able to affect even Oryx and the PC, which means it scales to 4D potency given that Oryx effortly shrugs off the effects of existing in the Ascendant plane and escaped The Darkness itself which fuels his taken power, and the PCs can momentarily hold out against him and can also survive the ascendant plane.
Idk about sealing. Riven was sealed in the dreaming city, but nothing done by Oryx is really a baseline level of an ability and even that was through Oryx outwitting Riven in the end and entrapping it in it's own wish. After Oryx died Riven started breaking down the barriers between the Dreaming City and realiry, even making slight excursions out of it's prison. There's also how it's mindhax was not limited at all, as it was able to string Uldren and the Fanatic along all the same.
Also important to know: Riven's mental stuff is subtle. While it can go all out and break a mind, take it's foe, or aggressively assume control, it normally takes a role in such a way the victim doesn't even realize their manipulation until it's too late, which AIDS in getting past mental barriers. This is how Riven managed to get to the Player Character, who would have been fine against an actual mental assault considering all the other stuff they've dealt with.
Basically, the PCs wanted to kill Riven. Riven wanted to get killed so it can cast it's Last Wish (all part of Savath├║n's plan) and as such Riven fed off this desire and ended up manipulating the PC into doing exactly what she wanted, with them not realizing until after the Dreaming City was caught in a causality loop and Savath├║n's Murder Battery was charging. That was due to Riven being strung along by Savathun that the last wish even happened so I don't think it's a default, but just to let you know.
Riven also has other powers than mindhax but I don't see them coming into play here just due to that alone. Greater Daemon of Slaanesh seems to stomp here, but I'd like to hear arguments against this.