Eris and Mylene weren't the only ones interested in opening a store, although Aster's level as a rune master or an alchemist wasn't high to enough to outstand, leaving aside the "elixir" he could create using his own blood of course, but that was perfectly okay for him, since his current main focus was to reach the Mortal Transcending realm and find the rest of the materials Rya needed.
Aster already chose to be a spirit blacksmith, not only because in the group Eris and Mylene already filled the place of alchemist and rune master, not to mention Camila who was also walking on the rune mastering path.