 Now consider an ontological supervenience claim: that there can be no difference in ethical properties without a difference in base properties. The quasi-realist program can seem to commit the quasi-realist to accepting this claim. Dreier (2015) argues that this leads to a further challenge to the non-cognitivist: even if she can explain ascriptive supervenience, it is not clear that she can explain ontological supervenience. If this is the case, the most influential contemporary non-cognitivists may find that supervenience is a dialectical burden rather than benefit.