Lissandra Explanation For Those Confused: Lissandra is a Warlock

For those that don't know what I mean by "a Warlock", it's someone that makes a pact with a more powerful being in order to gain power, but they themselves become servants of the more powerful being. The only difference here is that Lissandra ALREADY HAD pretty big power with True Ice Manipulation, but she wanted more. She turned to the Watchers for power, but secretly didn't serve them because she knew if they got what they wanted, she'd likely die. Therefore, she devised a plan to use the power she had obtained to imprison them. However, it seems the Watchers are not aware that Lissandra is the one that imprisoned them, so they just see her as their continued servant that will eventually help them get out of their prison.

However, this isn't to say Lissandra isn't evil anymore. She is still evil and wants power to rule. However, it's just the Watchers are a greater evil she bargained with for their power and then betrayed. She still wants to rule, just no longer with the Watchers basically.

The only thing that is still foggy is whether she wanted to rule with her sisters or not. It seems like she did, but they didn't want to rule a frozen world like her. Therefore, she had to turn against them because they opposed her plans although she still loved them as sisters.