Reavers Faithful Megamod for OpenXcom significantly expands the gameplay experience with numerous enhancements and content additions. Major features include the expansion of aircraft capabilities, new weapon iterations, and a rebalancing of alien encounters. The Lightning aircraft can now transport tanks, while the Heavy Plasma gun has been adjusted for increased damage but diminished usability. The mod introduces a total of 16 aircraft with advanced functionalities, and various tanks come with diverse weapon options, enhancing tactical flexibility during missions.

In addition to these changes, the mod introduces a comprehensive tier system where items at the same technology level offer unique advantages, promoting strategic diversity. The research system has also been revamped, allowing players to unlock multiple items simultaneously and choose their paths more freely. Plasma weapons require reverse-engineering, which adds depth to the manufacturing process. Overall, the Reavers Faithful Megamod enriches the OpenXcom experience with its thoughtful adjustments and new content.