  We report successful growth of millimeter-sized high quality single crystals
of V$_3$S$_4$, a candidate topological semimetal belonging to a low-symmetry
space group and consisting of only low atomic number elements. Using density
functional theory calculations and angle-resolved photoemission spectroscopy,
we show that the nonmagnetic phase of monoclinic V$_3$S$_4$ hosts type-II
Dirac-like quasiparticles which opens a sizable gap due to spin orbit coupling,
as well as theoretical multiple nodal lines that are eliminated also by spin
orbit coupling. These results suggest that relativistic effects give rise to
profound modifications of the topological properties even in compounds with
low-weight elements.
