Sealed Doors (Creation of)

Inquiry

Several sealed doors exist in 2300 A.D. bearing the mark of Zeal and requiring energy from the Mammon Machine to open. Who constructed these doors?

Answer

In all probability, Belthasar created them to safeguard and leave treasure for the expected saviors of time, Crono and his group. How he obtained the foresight to do this is unknown, but he does demonstrate a knowledge of the party and their quest when speaking of Death Peak through his Nu assistant. The only problematic aspect of this answer is that Belthasar would have had to journey long and hard through 2300 A.D. to reach all the domes he constructed doors in.

From: Common Questions