Nightstalker

See Valu's about.
Canon.
Esper's usurpation and witch plot is an AU

Daughter of the Prophet and High General Value, Nightstalker was at a disadvantage from the start. She was a female. By all rights she should have been given a low rank and made to mate. To continue her noble bloodline. But to her surprise, Valu saw something in her. Someone valuable. She was put into a different, new sort of training. She was still giving lessons on how to properly be subservient to males like all females born in the cult were, as well as their history and taught of the glory of the empire, but she was also taught how to kill. How to be silent. A shadow. She was also taught a far more extreme version of her servant lessons. She would live and breathe and die for her master. She would never take a mate or have pups as pups are a she wolves greatest strength but also weakness. She became an assassin and shadow to the crown. Currently that meant her father while her brother grew up. More than once her father called upon her and made use of her skills. Given how big the cult was now, dissenters were more common and risk of discovery of the cult increased. Nightstalker killed many dissenters or would be escapees. Even on occasion, a high ranking male who was getting too bold and overstepping. As her brother grew though, those kills grew less common. The came her biggest job of all. To kill the beta of the pack so her father would take his place. Fleetfoot, even with all his wisdom and greatness, was never able to become beta before his rebellion. This was because the then-alpha's beta was her best friend and never died. This made the rebellion harder. Had he been beta, surely they'd have claimed victory easily. So before they could officially restart the rebellion and give rise to their empire, Valu had to attain his beta-ship.

It was her biggest task of all. The Beta was one of the only remaining obstacles to their goal. But the beta was beta for a reason. He was huge and strong. But weak and soft hearted seeing as he never even TRIED to overthrow the smaller and weaker female alpha, Esper. So Nightstalker decided to use that softheartedness. She waited until her heat began and placed herself in the path of his personal daily patrol route. Faking a limp and whimper she was a hard trap to ignore. Sure enough he approached her, obviously trying not to make it obvious it was her heat that held most of his focus, he asked if she was alright and needed help. As Nightstalker was a wolf born and raised in the tunnels away from the pack, he believed her a rouge. She fake cowered at the paws of the massive wolf and nodded, scraping her muzzle on the ground in a show of submission. "A-alright. D-do you want me to take you back to my pack? We can help you with that limp…" she again nodded and leaned against him as if needing support. The beta began to lead her back but then she asked if there was a cave they could rest in, she was too tired to keep walking. Once in his cave, which was coincidentally the nearest one, Nightstalker began to drop the necessary hints and motions for the beta to take the plunge.

And plunge he did. They lay next to each other, beta deep in sleep after it all, that he had forgotten to go get the medicine wolf for his new fling's limp. Nightstalker rose with a smirk. She was also very tired, but aware enough to slit his throat before he could wake.

Valu would be beta by next moonhigh.