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This is a really great addition to the game as it adds Secret Societies to the game. Secret Societies can be toggled on or off so they don't fundamentally change the game for people who do not want them to, but still give an option for a game with more crazy mechanics. This is good because this mode does have some problems. This also adds Ethiopia to the game which is one of the most powerful civs to play.
Secret Societies are pretty fun and have abilities that compliment different playstyles - Minerva/ (Commerce/diplomacy), Voidsingers (Culture/Faith), Hermetic (Science) and Sanguine (Military). They can become wildly overpowered in the hands of a player. For example - a Minerva player can get envoys from trade routes to city states and use this to get all of city state bonuses. Horde gold over the course of the game with gilded vaults and then collect a % interest off their total gold in the later parts of the game. A Voidsinger player can rush faith monuments to get the best pantheon for their religion and then use their late game abilities to get an obscene amount of relics and modifiers for a cultural or religious victory. A Hermetic player can rush a science victory with their superior universities and obscene adjacency bonuses, and a Vampire player can just conquer everybody with OP vampires that can teleport between vampire castles.
The Secret Societies mode does have some problems. Most of the AI will get the Voidsingers because they unlock from finding a tribal village. Being the same society as the AI makes them friendly with the player so this can make for much easier games. Likewise, being rushed by an AI with vampires when you do not have them is obscenely difficult to deal with even if one has take the time to build a proper military. The free governor from finding ones first society also fundamentally changes the game and makes stuff like settler spamming at the start of the game more viable. Some Civs like Trajan's Rome are also wildly overpowered as their free monument also now generates faith and Pericles can use Minerva to get city states that increase their culture production by 5%.
Ethiopia is probably one the best civs in the game. They get faith from all improved resources (bonus and luxury) and this stacks when they get multiples of the resource. They also get faith from trade routes. However, what makes them insane is that they get science and culture from 15% of their faith. This can become quite alot for a passive bonus. The cherry on top is that they have a starting bias favouring hills which is the best start in the game. Great production and probably near mountains that give holy sites and campuses lots of adjacency bonuses.