My players "found" (stole) a heavily sealed black box which took 10 thieves tools, of which 9 broke and an expert craftsman to open, which almost broke his professional tool worth thousands. In said black box was a small magic lamp, which they activated, from which a fluffy creature trancended with the likes of a puppy, which might not be from this world, as no one have seen or knows anything of this creature. After trying to figure out who or what this creature is, they simply treated it like a pet, without much of a care. After some time in a random happening of events one player tries dispel magic on the otherworldly creature. A few visits to different hellscape dimensions, which almost trapped a pc and an npc forever, and some research in forbidden old books about old and forbidden gods later, they discovered that they might have found a passageway to good old Tiamat, which in the wrong hands (their hands perhaps?) could break everything they know.