The Bilhaw (Sergeinus and Dark Golem in fan-translations) is a recurring monster in the Dragon Quest series. Introduced in Dragon Quest V, it is a stronger, greenish-blue colored variant of the Balhib.
Like Balhibs, Bilhaws are centaur-like, having four legs and two arms, winged, and have thick tails. They also wield axes like Balhibs do. The primary difference in appearance is that Bilhaws are a far less lustrous shade of blue.
Having initially appeared as a bonus dungeon monster, Bilhaws have the strength that comes with such a role. While they tend to pay out a large amount of gold, it is not nearly as much as the amount given by Balhibs.
Making their first appearance, Bilhaws cannot be fought until after the player beats the game since they only appear in the bonus dungeon. Like Balhibs, they are sturdy creatures with a lot of HP and can deliver devastating desperate attacks if given the chance.
Sizz being used on two Bilhaws.