two things, the arbiter wasn't called the arbiter in Halo CE, he wasn't even mentioned, he wasn't the arbiter until Halo 2. also, get rid of the hint system and make it so the name of the game counts.
A tip against ancient monoliths, use Lances unload skill with deep blue equipped, it'll do a good 6k+ damage with the bullets and then a waterspout that does 6-7k more.