As the season is winding down, the revelations are coming thick and fast. The trial is for Lilia, the coven's seer. My guess about the road under the Witches' Road proved correct. Lilia and Jen, having been hurled into the bog, get sucked under and deposited in an underground passage. The route to this trial, though, takes place within the fractured and improperly sequenced timeline of Lilia's centuries' old existence.
The creativity of this episode in telling the story through a disordered jumble of scenes -- that gives the audience a taste of the disorientating kind of life Lilia has lived -- and still making them all make sense to the overall narrative so far is amazing. When all the pieces fall into place for both Lilia and us, her sporadic and incongruous outbursts throughout the season turn out to be spot-on premonitions and warnings acquired from the future, but are too fragmented and devoid of context to be useful. This is exactly Lilia's gift and curse, and the reason she has chosen to neglect her power. Just because she can see the future does not give her any ability to alter it, so what's the point when all she sees is Death?
Lilia's trial helps her understand her true purpose, finally giving the lion the courage to face her visions and see them through to the end. When seen in their totality, her visions are not really as bad as when she just catches glimpses of incomprehensible bits and pieces which are scary because without proper context they seem so random, hopeless, and futile. This key realization gives her the means to literally turn the tables on the Salem's Seven with some apparent finality, and not a moment too soon. For Lilia, herself, it's bittersweet that the end of her trial gives her a new beginning too.
Also, it seems to me that each episode, like in Wandavision, moves our characters through time. In AAA, the movement is backwards through history. Episode 7 puts us in a medieval setting, but the costumes are based on contemporary Hollywood depictions of fairy tale witches. Agatha is the classical Wicked Witch of the West, which is the persona she projects in front of people. Billy is Disney's Maleficent (I admit I don't yet see the symbolism, though he does brag about having the cheekbones for it, referencing Angelina Jolie who played the role). Jen is dressed as the Disney version of Snow White's evil stepmom in disguise as the hooded fruit vendor bearing a poisoned apple as a reference to Jen being a shyster hawking toxic products prior to the Road. Lilia is dressed as the classical Glinda, the Good Witch of the North, who although takes offence at the cultural stereotyping heroically plays out the role for real by the end of the episode. While Agatha already knows who Rio is, Rio's true identity is revealed in this episode too, although among the rest of the coven only Lilia gets to see it.