Somnica Valley, land of the onironauts.
Nobody could guess the revolutionary impact of the discovery of this place and thanks the fortuitous chance. This started when a group of spellcasters tried to create a project of hibernation chambers, to heal the sick and wounded, and even if the damage was too serious, to be totally frozen for the necessary time. This should work as a cheaper version of the magic for return to the life, but sometimes the results are very different.
The initial tets with volunteers (some of them criminals who accepted in exchange for a reduced sentence) didn't show signs of physical or psychological damage, but some strange side effects, and even, never better said, totally surreal.
The volunteers told when they were sleeping within the experimental chambers they dreamed they were in a totally unknow zone. The most of times was in the ruins of a big city where the buildings were mainly by crystal, metal and mortar. There were in the middle of the street vestiges of vehicles, with smaller wheels, by a material whose touch was reminiscent of resin, and without hitching of horses or draft animals. And the most curious and relevant detail is they were very small, as much as rats, squirels or mice. Without tools the survival had been a true hell without the help of the kercpas, antropomorphic squirrel. There are other "tribes" of native humanoids, but most of them are hostile, like gnolls, goblings, bugbears, kobolds, and even a formian army ruled by a warlord werevernim.
Some dreamers when they could return from that dream and wake up, some times find next to them some items or threasures they found in the dream.
The somnica valley is a very interesting place for the sages, but too little chance of physical reward for the adventurers. The exploration could be worth for some artificers who search remains of advanced technology from those ruins, but without the right tools the reverse ingeneering is too dificult, and a lot of times the onironauts appear in wild zones without remains of advance tech. If they are lucky some times they can return with tissue samples from unknown species, even enoughly good to allow the creation of possible clones. Even when these are shorter-lifed, they can live enough to breed a totally healthy new generation
Some new models of statis chamber mixed with teletransportation magic allow the onironauts or dreamwalkers to visit the Somnica Valley with some items, but magical objects only with low level. This allow more possibilities of phisical rewards.