Is this small paragraph worded in the best way?

FYI- Szass Tam is the lich. The atropal Xingax, the lich’s leading manufacturer of undead creatures, who had replaced damaged body parts with those of the fallen nighthaunt Ysval, used the abilities that the grafts conferred to enshroud the battlefield in a magical gloom. The wraiths and other undead entities serving Szass Tam that could not withstand daylight, including Tammith, immediately entered the fight and engaged the southern forces. In the Keep of Sorrows, So-Kehur cast a necromantic spell that transformed the dead bodies in the fortress’s crypts into undead soldiers while Muthoth summoned a caller in darkness. As the undead creatures attacked and slaughtered the castle’s garrison, the two necromancers continually reanimated the fallen defenders in order to strengthen their force.