A rumor whispered among adventurers
The Bagman was once an adventurer who sought to escape doom by abandoning his party and hiding inside a bag of holding. When he tried to leave, he became lost amid a constantly increasing number of extradimensional storage spaces. Over time, the strange forces of this magical in-between place transformed him into something monstrous.
Now, every night, the Bagman slips out from a random bag of holding. If he cannot find his way home, he drags someone back into the bag with him — leaving behind a trinket from his hidden kingdom of lost junk as the only sign he was ever there.
How to Summon Him
Speak too loudly over an open bag of holding. Or whisper “follow my voice” into a magical storage space three times.
The Bagman will come for you.
…or so the rumors say.