Identify a story about a teen boy who learns to use magic with his lizard companion

Question

Can you help me identify a book I read? It was intended for teenagers. I believe I read it in the late 1980s or early 1990s.

The main character is a teenage human boy from earth, who is learning to use magic with the help of a humanoid lizard companion, who knows all about magic, but can't use magic himself. They travel to numerous worlds.

I remember one of the lessons was to draw in magic from the ground with every step he takes. And there are different lines or streams of magic flowing through the world. Different areas have different concentrations of magic to draw from.

At one point they travel to another world where there is a bazaar or marketplace selling lots of different things.

I believe at one point they travel to yet another world where they are hanged. The main character survives by lifting himself up by using magic, and the lizard companion uses his strong neck muscles to avoid being killed.

I believe there's also a house where the front door is in one world, but the rest of the house is in a different world.

Answer 1

It sounds like Myth Adventures. The "lizard" is a scaled "demon" (dimensional traveler) named Aahz from the world of Perv. In the first book, Another Fine Myth, indeed Aahz teaches Skeeve (who is actually from the medieval fantasy world of Klah) to use ley lines to pull in magic. They visit the Bazaar on Deva, but before that, on Klah, they are sentenced to be hanged. Skeeve survives by levitating himself and Aahz survives due to strong neck muscles.

The house with the doors that go different places shows up in Mything Persons, where they learn that a door in the house goes to Limbo, which is filled with vampires.