The feat ephemeral tread paired with the spell dream travel, seems to let you travel to the dimension of dreams, and perform impossible actions. This seems to let you at a low level, cast wish upon yourself to gain permanent bonuses. Or to create an artifact, then astral project yourself onto the material plane with new artifacts? Is this actually possible uses or is there something that prevents the use of such powerful methods?
Using astral projection would be difficult as you would have to work around the duration of dream travel and the 1/day impossible action. However I’m sure there exist methods to prolong or regain your use while on the dimension of dream.