[Desiani]

I am wanting to create either a Null Wizard Pariah Mysad or a dabbler of Shedim. 

Question one: What/where is "opposition metamagic" that pariah tradition requires you to take.

Question two: Is making pacts and dealing with Shedim as bad as Insects or Toxic? Where/What book details shedim in more detail that just the spirit stats and vague back story.

[Sphinx]

Shedim are worse than toxics or bugs. You can find information about them in the SR5 Street Grimoire (p.93), SR4 Street Magic (p.154), and SR3 Year of the Comet (p.92, 149).

[Desiani]

Thank you very much <3

[Seras]

There is also new information (backround and game wise ) in the Dark Terror supplement for SR5.

Marooned Spirits page 34 to 50

It's nasty !!

[Desiani]

Thank you. Now to make my spell casting mage hunter... Tons of super fun.