[quote=@Etcetera]
<Snipped quote by DarkwolfX37>

And each one has unique properties to leverage?
[/quote]

Yes. Nearly every supernatural force of any kind has some weakness. There are rare cases of hybrids that cover their own weaknesses, but usually combining different sources means combining the weaknesses as well. Even if the weakness is as simple as an aversion to silver, for example. The hard part is keeping track of what is best used against what.