A Hard-Boiled Heat Arrowgun has a light grey center with red edges and is surrounded by a thick, gear-like ring. This ring is black with thin, red edges. The black barrel is very wide and short with a similar gear-like shape to the body. The handle is black and the guard, which is lined by six black diamonds with white edges, is red. The diamonds flash the same color as the bullets (red) when Xigbar reloads. The bullets produce red sparks on contact with enemies and gold ones on contact with anything else.
Its Japanese name, Hard-Boiled, comes from a method of cooking eggs. The English name is an embellished form of the above. In colloquialism, to be "hard-boiled" means to be tough and experienced.
In Xigbar's ground combo, he fires four shots diagonally forward—two to the right and two to the left—repeats this, and then fires four larger, charged shots in the same manner.
His aerial combo consists of him holding his Arrowguns together and firing four simultaneous, charged shots in a wide "X" pattern.