Dwarven Fury

When smoked by a dwarf,
this sour smelling underground moss
renders the dwarf immune to gaining
exhaustion for the 2d4 hours, after which
they must make a DC 8+(number of
hours)+(levels of exhaustion) Constitution
saving throw. On a failed save, they gain
all levels of exhaustion they would have
taken during the period. If a non-dwarf
attempts to use it, they must make a DC
16 Constitution saving throw to gain the
effects. Otherwise, they are poisoned for
the duration instead.