  High-order topological charge is of intensive interest in the field of
topological matters. In real materials, cubic Dirac point is rare and the
chiral charge of one Weyl point (WP) has never be found to exceed |C| = 3 for
spin- 1/2 electronic systems. In this work, we argue that a cubic Dirac point
can result in one quadruple WP (|C| = 4 with double band degeneracy) when
time-reversal symmetry is broken, provided that this cubic Dirac point is away
from the high-symmetry points and involves coupling of eight bands, rather than
four bands that were thought to be sufficient to describe a Dirac point. The
eight-band manifold can be realized in materials with screw symmetry. Near the
zone boundary along the screw axis, the folded bands are coupled to their
"parent" bands, resulting in doubling dimension of the Hilbert space. Indeed,
in "$\epsilon$-TaN (space group 194 with screw symmetry) we find a quadruple WP
when applying a Zeeman field along the screw axis. This quadruple WP away from
high symmetry points is distinct from highly degenerate nodes at the
high-symmetry points already reported. We further find that such a high chiral
charge might be related to the parity mixing of bands with high degeneracy,
which in turn alters the screw eigenvalues and the resulted chiral charge.
