A. Dalton mentions Belthasar was working on something like the Epoch in the Commons in 12,000 B.C. right after he decides to take over what's left of the world. It's safe to presume that Belthasar WAS working on the Epoch, and considering the lack of resources he had in the future, as well as him growing old, senile and mad, it's safe to say it's the same Epoch in 12,000 B.C. that was gated with him. Due to his lack of resources he was only able to make it capable of time travel, however his "Wings of Time" didn't even have wings.
B. He had a very powerful level of Zealian magic. He was able to make the illusion of Viper Manor in Terra Tower. This is done in RD's Viper Manor in one of the scenarios, when you can't find the doorway out of Viper Manor.