"Shiryoujutsushi nado Kegarawashii" to Shokei sareta node, Mazoku ni Tenshin Itashimasu

A duke's daughter and the crown prince's fiancee... I, Rachel Sheringham, wielded dark attribute magic, which allowed me to use necromancy. I was accused of colluding with demons due to it and was executed. With regret as my source of power, I will return to life as a lich!!!
(Source: Takeshobo, translated)