Are these two sentences correctly worded?

Drizzt suffered through the teachings until his graduation finally arrived, and a ceremony was conducted in which the students inhaled mind-fogging drugs and subjected themselves to the sensual pleasures of the female students of Arach-Tinilith. However, Drizzt, being the unique drow that he was, rejected the offer, and he was then brought to the land of the driders by Vierna as a punishment for refusing a priestess.