The ring is surrounded by a steel cage. Escape is not permitted.
To win, one must incapacitate their opponent to the point where they cannot answer a 10 count.
DQs/Count Outs/Rope Breaks are all not enforced.
The Steel Cage match and the Last Woman Standing match. Both were often barbaric bouts on their own, both stipulations making the competitors put in their very all to destroy their opponents. The Steel Cage locked the women inside the ring, disallowing anyone to exit it, and was often a very potent weapon used in destroying one. Bodies and heads slamming against the steel, faces ground against the mesh, and extremely high falls often occupy what you see in such a match, and in the end, neither woman leaves that cage the same they entered it.
Same for the Last Woman Standing match. To pin your opponent to the mat for a 3 count is already a feat, but to incapacitate your opponent so that they are unable to answer a 10 count is an even greater feat. And with the disqualification and count out rules lifted, it gave the competitors all the more tools to inflict pain onto each other, in hopes to making them lay down for the 10. The harm inflicted on one in order to achieve this victory condition often took weeks, if not months to recover from.
Now, imagine them being combined. Two women, locked inside a brutal cage, and they must destroy each other to the point where neither woman can get back to their feet at the count of 10. That was the reality of the situation for two women: one who knew all too well why she wanted such a match, and the other who knew nothing about their opponent, but still wished to crush them into the ground. A month ago, there was a backstage confrontation between two women. Karen Adams, who was recovering from injuries sustained in a previous match, and Indra Vega, a newcomer who made her presence known to Karen by attacking her in her locker room, and would've likely worsened her injuries in not for the presence of a friend, Lena Mei-Xing.
And as the cage was lowered and set in place, the first to come out was Indra Vega.
Spoiler
A referee at ringside opened up the cage door for her, allowing Indra to enter the cage, and her fingers ran along the mesh of it. There was no give in any of the walls, meaning there would be nothing but pain awaiting anyone sent into them, as effective as a brick wall. Indra already knew her body was likely to be rammed up against the steel eventually over the course of the match. As much as she hated Karen, she didn't believe she would prove to be just a ragdoll in their match, despite the head injury that she was fighting off. All Indra could do was prepare for that, and will herself to fight through it, and ensure that her opponent was the one who laid on the mat, a victim of the brutality of the match, and ended up the loser, with Indra's foot over her chest.