Are these sentences correctly worded?

FYI- Tsabrak is the wizard. The matron mother commanded Tsabrak to learn a powerful spell known as the Darkening from Methil, who would impart the knowledge directly into the wizard's mind, and then journey through the Underdark to the Silver Marches, where he would cast the enchantment. Created and powered by the Spider Queen herself, the Darkening was a spell that would steal the daylight of the lands of the Silver Marches, changing the region into an advantageous battlefield for the drow of Menzoberranzan.