Syrlya has been utilizing his invisibility magic, mostly to avoid being noticed when going to bunk with people with the resistance/watch the area near the tunnels and in some cases to clear distance to the jail cell without getting stopped. It's not 100% upkeep so he's tried to combine it with good ol' hiding the the shadows/alleys.

When engaging with Kenoma/Achamites though, he's been very visible and hasn't bothered to obscure himself.