Brick Mould is a tool included in the Millenaire mod. It cannot be crafted, but instead it can be purchased from or found in Hindu villages.
In your inventory, the brick mould appears as a thick ladder with three rungs.
The Brick Mould can be used to make a wet brick if the player uses the brick mould on a surface and has at least 1 dirt block and 1 sand block in their inventory. This wet brick will turn into a mud brick after a random amount of time. The brick mould, like other tools, will eventually break after repeated use, and can be repaired by crafting 2 together.