One of the mages cast the InVi spell "am I in a magic aura", however demonic BS will trump magic divination, so this is a case where I ruled (without telling the players) that the spell wouldn't cut it. The Grog making 15 on his Per+Detect (un)Holiness was the only way to just get the information (another would be to find the numbers of botch dice that I asked them to roll to be unusually high and to work things backwards from there). The grog had a fair chance, since he was rolling 8+stress die...
They do not have an Aegis yet.
Yes, the major has major flaw reckless. He sacrificed a finger to Radegast when visiting mount Radhost (gaining 1 confidence and 1 warping as part of the weird ceremony). The Ghost was forthright about trying to deal in life with the demon Lord Grimnir, the bringer of disasters, to stop the famine. The Ghost even gave them directions to finding a scroll of Infernal lore hidden in her lab, that contained her notes on said demon lord...
I know my players since 15-20 years, these are not just randos I met online.
This is exactly the kind of punches that they roll with. The players of the other mages immediately started joking about having a haunted Covenant.
They are gradually sinking into demon taint, they didn't do any further checked on the vis they obtained from the Earthshaker Bull, despite all the hints avbout the bull stinking mad anger etc They instead kept the cows which he'd studded, and having obtained a jet black calf, are fattening him up to become the Covenant's stud. The corrupted Te vis has been used to make the "Ring of Avaricious Delving".