The challenge is: No Shields. This means, when the round starts, you must turn the BC's shields to 0 GW, and leave it there for the rest of the game. In addition, you may not buy small shields for ships. (EDIT: The corvette's reflective shield is okay to use)
In addition, some generic rules: Games must be 6v6. If people leave before the kermiculite spawns, or if the teams get imbalanced by 2 or more, the game doesn't count. Winning before the 20 minute mark technically counts, but rushing is not in the spirit of the challenge.
First team to post a (non-rush) success replay gets bragging rights.