Are these sentences worded int he correct way?

FYI- Pavel is the cleric, and Sammaster is the lich/undead mage. Meanwhile, Pavel, Taegan, and a small band of their comrades entered the citadel and fought their way through the lich’s defenses to reach the heart of the Rage. After discovering that Sammaster had gained control over the Dracorage mythal by fusing his phylactery with the ancient magic, Pavel was forced to endure the poisonous touch of the mystical hellfire that the undead mage was using to power the enchantment in order to perform the counterspell. While his companions defended him from the two draconic golems serving the lich as guardians, Pavel destroyed the phylactery, ending the Rage and killing Sammaster, but the cleric of Lathander soon died of his own wounds.