This module is very interesting given the intended party is for 4-8 characters of levels 25-30 (minimum total levels of 150)! It doesn't play like many other modules, since it features: - Large scale naval combat - Ships flying through space - Divine interference - Multiple mass combats - Battling the forces of a Chaotic Immortal
Overall it's very hard to determine how challenging this module would be. It's definitely interesting to read, as an artifact of its time, but it would require a very dedicated DM to make it playable. Likely modern players would fail miserably to complete the adventure, given all of the challenges and mass combat required.