So let's recheck...

Freshly created vampires spawn:
-Tear their way through a dwarf fortress like a hot knife through butter.

Strongest non-unique monster that Hel can gate to her followers:
-Has the defensive advantage and earth elemental summon support yet takes several comics to kill a single old dwarf that was already at death's door and so wanted to get killed in battle for an honorable end before a "dishonorable" demise in the bed.

Clearly they shouldn't have bothered with the deathcrawler and just gated a bunch of extra vampires.