Is this paragraph worded in the best way?

As Bareris traveled through the mountains toward Thay, he was pursued by undead that Xingax sent to hunt him down. After days of evading the creatures, Bareris was assailed by a banshee, but defeated the spirit with the assistance of Mirror, the ghost of paladin. Mirror took Bareris to meet his companion, the gravecrawler Quickstrike, who told the bard that the ghost would help him stay hidden from his undead pursuers and guide him back to Thay. Several days later, Bareris and Mirror reached the Pass of Thazar, where they encountered Aoth and Brightwing while the pair was scouting the area to ensure that all the undead had retreated into the Keep of Thazar after Nymia and Milsantos’s forces had chased the creatures up the pass