
Contigency contract is a mode from game Arknights, which greatly increase the difficulty of the game. So does it in Minecraft.
If you think that your Minecraft game is too easy,you can install the mod and challenge your self.
Just create a new survival world,press [V] to open a tag seletor,where you can select tags that make the game more difficult.
Attention:selecting all tags will make the game VERY difficult, like zombie will have 100+ hearts of health.
You can press [H] to select helping tags if needed.