On the shelter was a strange panel.
It looked like a digital security lock...
There were three entry fields, and three symbols besides them.
One had a pine tree beside it.
One had an officer's badge beside it.
And one had the DELTA RUNE.

...
Finally had some free time to work on this! It was a great opportunity to practice drawing my most favourite Lightners - Carol Holiday and Alvin Boom - around the theme of the shelter mystery.

While I prefer to think that the DELTA RUNE symbol represents the church, and thus Alvin is the one responsible for that code, I still wanted to include Toriel here. She is an important monster of Hometown with authority of her own, and that includes her leading the church choir. In my personal experience so far, I have not encountered much of any ideas about how Toriel herself would become involved in a scenario around the shelter in the future, Conspiracy-related or not. That only helped my decision to try and depict her there as being ready to confront whatever or whomever stands in her way.

To be honest, to this day I am still not invested in the whole… Hometown Knight Conspiracy idea. Otherwise I would have also added the Roaring Knight and Kris somewhere.