things racial hd is better then class abilities

[CyberThread]

Are there things that scale or rely on racial hit die in the way that things like the feral template does?

[Zanos]

Usually the DC's of natural abilities like poison scale off of racial hit dice.

[Grim Portent]

The save DC for dragon breath attacks and the Half-Dragon breath attack improve based on RHD.

[Necroticplague]

Phaerimm casting is based on HD, whether it be racial or not.