[@A Heretic] If you read the posts it definitely seems like everyone already knows, or at least suspects that fact.

[quote=Hrossbjorn]
Hrossbjorn differed in his thoughts about the newcomers. They each held a certain skill set that could make or break his effort to make it to the Castle Estel.  A woman who can control the weather could serve useful if the village turns out to be not safe, and a necromancer can bring in support from the dead if they run into the vanguard of the Mad Kings’ army.
[/quote]

[quote=Gyrid]
Now, she had to endure a week of playing nice to one who she suspected of being a necromancer and another two of being abominations.    
[/quote]

[quote= Katerina Wythono]
I stole a glance at the pale man with the horrible book in his satchel. My hands reflexively curled into a fist upon thinking about the danger that book represented to the Harmony, but I chose to stay my hand. When I had won the support of the rest of the group, I would be able to safely turn on the sickened man and that poison he so worshiped. 
[/quote]

Doesn't look like it's exactly a secret.