Is this small passage properly structured and worded?

Joined by Chatulio, the group used magic to journey beneath the sea and explored the haunted ruins of the city. Upon their arrival in Northkeep, the companions were immediately attacked by a Styx dragon and several skeletal wyrms animated by necromancy that Sammaster had left as guardians to protect the secrets hidden within the ruined city. After a fierce battle, the hunters and their dragon comrades defeated the lich’s minions, but they then had to face the spectral warriors who had haunted Northkeep since its destruction. Dorn averted a fight with the wraiths by convincing them of the group’s righteous intentions in exploring the ruins.