Before the attack of the masked undead…
Adrian already found out the fortress he defended during the first undead siege is being targeted once more by the undead marching towards the north. He used a complex array of triangulation and equations to solve the trajectory of the marching undead meaning he used the internet.
Adrian already teleported himself towards the Alabaster Fortress in hopes of participating with the defense. Adrian decided to hide in plain sight by blending in with the adventurers that are below the fortress walls. He did not just use his human persona but change his look to become a gnome.
He successfully blended in and when others asked his job class then he would answer that he is a Rogue. He used his twin dagger psyche armaments as weapons so that he could disguise himself efficiently. If he used his human disguise then some Evergreen guild members might notice him as he already noticed some he already met before.