Dusk Giants and Barghests and ______s, oh my!

[tuesdayscoming]

I'm looking for any and all creatures that, like the right honorable Dusk Giant and Barghest, have an ability that allows them to gain HD through methods other than experience gain.

Whether it be supernatural (like the Barghest's Feed ability), extraordinary (like the Dusk Giant's Cannibalize) or anything else under the sun, I'd like to know about it!

For those curious few: I'm working on a way to boost a creature's HD to make simulacrums with >1/2 normal HD; while Inspire Greatness optimization gets me a good ways, and either of the above creatures could get me where I need, I'd like to know if there are any other options out there.

Thanks, everyone!

[zook1shoe]

Beast of Bane, Lycanthropes, Bug-thropes, and Redcaps come to mind

[Amechra]

Just as a quick note, Dusk Giants don't actually work for this. Their ability explicitly both caps the number of extra HD they can get and specifically states that your statblock changes to the next "stage" of Dusk Giant.

Also, there is a question about whether or not using the Barghest's Feed ability would transform you into a Greater Barghest, and the ability technically has a 18 HD cap...

[Mithril Leaf]

Maurezhi from the Fiend Folio can feed to gain HD in a manor similar to barghest. They have animate dead as an SLA at will with a CL equal to their hit dice.