Apprentice Refiner is a NPC.
Apprentice Refiners are mainly found in Eversun South and North around the grade 1 and grade 2 collection areas. Only one can be found outside of those areas, in Swan Lake Basin.
According to Worker No.1, Apprentice Refiners produce lower quality products. Whether this means they can only excellent regular quality materials or that their refined materials have a bigger chance of failing is unknown.