[Snake]

I like the idea of it being stronger at lower HP, it's more 'Ghost'-like. As well as Wraithguard qualifying as an evasion-type, since it's said in the Lore Thread that Wraithguard is more a 'you being more and more cautious as death approaches', instead of some solid shield made of spectres a la Hexer.

So, 1% of Wraithguard's damage reduction per 2% of missing HP might sound cool? (An actual buff in a sense, but more conditional.)