The Twilight Company Book 1 - V.A. Lewis, C.C. Tyrion

Tempest, fired from his job and dumped by his girlfriend, opens a package from his former employer—only to be transported into a realm of magic, monsters, and cute goblin thieves who can’t keep their hands out of his pockets. He’s entered the world of Rathos as a “venturer”: beings attuned to magic via enchanted glyphs in their palms.