Board Thread:General Discussion/@comment-26006155-20190820122909/@comment-26006155-20190826113139

Jacky720 wrote: You've misread yet again. The proposal being made is that Gaster brought modern technology when he came to the Underground in 1700s AD which is a few years before Asriel was born.

Timeline: We've already established that Asriel was born while the capital was still in Home.
 * 1) War of Humans and Monsters in medieval time
 * 2) Several years pass
 * 3) Monsterkind expands to the rest of the Underground.
 * 4) Gaster shows up, builds CORE
 * 5) Asriel is born
 * 6) About 10 years
 * 7) 201X
 * 8) Chara falls
 * 9) Gaster is shattered.
 * 10) Buttercup incident
 * 11) Many, many years, during which monster technology in the CORE is stagnant at Gaster's level and slowly increases in ability in the rest of the Underground. Six humans fall.
 * 12) Modern times. CORE is still futuristic, most of the Underground is modern.
 * 13) Frisk falls.

Asriel was born before the Core was constructed. Otherwise they wouldn't have built a room for him in Home at all, both he and Chara would just have gets in New Home.

This theory relies on the idea that ALL MONSTER TECH COMES FROM GASTER. Again, Undyne, Alphys, Bratty and Catty all contradict this, as they find studying human garbage fascinating, and a boon to monster tech.