Jet: There are a lot of ways for the canny mortal to get into Heck, actually. The most common is to use powerful magic to cleave the barrier between worlds. Heck, being a hub world, is spiritually close to every other dimension in the multiverse, so it’s not as hard as worldhopping normally is. However, if you’re not a powerful mage…you have to rely on accidental Tears in the fabric of reality. But those are exceedingly rare. It hasn’t happened more time than you can count on the fingers of one hand in millennia.