  We consider the torus compactifications with flux of a class of $6d$ $(1,0)$
SCFTs that can be engineered as the low-energy theories on M$5$-branes near an
M$9$-plane on a $C^2/Z_2$ singularity. Specifically, we concentrate on the two
SCFTs where the $Z_2$ orbifold action acts non-trivially on the $E_8$ global
symmetry. We analyze this problem by compactifying to $5d$, where we can
exploit the relation to $5d$ duality domain walls. By a suitable guess of the
domain wall theories, the resulting $4d$ theories can be conjectured. These can
then be tested by comparing their properties, notably anomalies and symmetries,
against the $6d$ expectations. These constructions lead to various interesting
$4d$ phenomena like dualities and symmetry enhancements.
