Currently it makes the game stuck after you defeat the first boss. Its an old mod tho, so I don't doubt it's probably abandoned.

Haha that one's a reference to the dark mode from the MMBN games. It was meant to be vague but I supposed I could give it an actual description. It can only appear if you're below half health after fighting a boss. It stops your mana regen but gives you mana when you fire the weapon, which deals high damage (for a weapon), but also randomly teleports you. It also increases the power of all your spells.

However, the weapon damages you and casting spells reduces your MaxHP, so it's powerful, but a double-edged sword.

There is one issue that I forgot to state in the previous comment; The Dark Contract. It's not very descriptive, and it says it just kills. But when I use it, it only does 60 damage. It ALSO stops my mana from regenerating unless I use it (in which case I get one whole mana back). Am I just misunderstanding something from this one? Or is it suppose to be vague?

This is a pretty interesting mod! Having your weapon change to whatever contract you've taken is a pretty neat idea, and you can be very creative with how you use them too. For example, the Glimmer contract changes your weapon into a bomb that deals 40 damage if it's attacked within a certain amount of time. However, it's also considered an object. So you could trap your enemies in a ring of bombs, and use your ranged attacks to hit them while they are (almost) immobilized. I just wish there was a way to get these without killing a boss. Otherwise, great mod so far! Especially since it's in beta.