Well, a major theme is the power of love. It's shown to overcome various obstacles in the fantasy settings, whether it's a curse or a war between different factions. Another theme is the exploration of female identity. The characters are usually in a process of defining themselves not just in terms of their sexual orientation but also in relation to the power structures and cultures in the fantasy world. Community is also a theme, as the female characters often find support from other women, either in a group of friends or in a wider female - centered community.
One common theme is self - discovery. In these novels, the female characters often discover their sexual orientation while on their fantastical journeys. Another theme is acceptance, both self - acceptance and acceptance from society within the fictional world. For example, in some novels, the characters have to deal with a world that may not be fully accepting at first. Magic is also a common theme, as it often plays a role in bringing the characters together or in their personal growth.
The theme of secrecy is quite common. In many fantasy lesbian romance novels, the characters have to keep their relationship a secret due to various reasons like social norms or political situations in the fictional world. Another theme is the idea of transformation. This can be physical, like turning into a mythical creature, or emotional and mental, as the characters grow through their relationship. And of course, adventure is a theme, as the characters often go on quests or travels which are intertwined with their romantic story.