Actually, there were some of the Miles troops that were missing for a while. Apparently, he has been searching for them, for a while now but there was no fruit to his search.
They disappeared in thin air and even their family didn't want to talk about what happened to them.
But finally, he found the first clue towards finding those troops. This guy told us about a place that can help us find those troops.
According to his words,
"Helm bought various types of ominous things from them and took it to a particular place."
The place he mentioned was an underground basement below one of the shop stalls near the city. Well, he did also say that there are various other ways to access that place, like a sewer system. But apparently, that underground area under the stall will be the fastest route there.