Tessa Mayfair may have met her untimely demise in Anne Rice's Mayfair Witches episode 7, but her role in the series was pivotal to Rowan's development. After a season spent spurning the power of the designee at every turn, Rowan (played by The White Lotus' Alexandra Daddario) chose to resign as host of the spirit Lasher and transfer ownership to her cousin. But when Tessa was most in need, he did not come to her aid, revealing that the transference failed and only Rowan could call him back.

https://screenrant.com/mayfair-witches-episode-7-madison-wolfe-interview/