Essentially, considering we are heading into a land of daemonic intrusions, heretic cults and rogue psykers, the Inquisition in their infinite mercy and capacity to think ahead have bestowed upon all of you, 2 Purity Seals each of Good quality. The GM, in his infinite desire to watch you second guess yourselves offers your 3 choices. Pick two and tell me which either in game or here. If you tell me here, I will assume that is your choice for the game unless you tell me otherwise beforehand. Here are your choices.
1) Fides Validus Daemonica or Hereticus Purity Seal
Gives a +10% to any WP roll to resist the Fear-inducing abilities of either Daemons or Heretics, both supernatural and natural. Pick one or the other.
2) Per Orbem Terrarum Puirty Seal
Gives +10% on WP or scrutiny rolls to resist the false charms and seductive lies of Mankind's enemeis.
3) Tutela Obviam Veneficus Purity Seal
Gives +10% to any WP test to resist a psychic power used against you.
And for Kaylin ONLY, as the 3rd option is utterly useless to her anyway due to natural immunity to such things:
4) Speravi In Te, Imperator Purity Seal
Gives +10% on WP rolls to resist pinning.
Rules for their usage are simple. When you have them on and wear them prominently, they give the bonus. When you don't have them on or worn prominently, they don't. You need either Common or Scholastic Lore on (Imperial Creed) for them to work properly. If you lack that skill, then you can still wear it at half effectiveness (5%) due to superstition.
I give no hints on which ones may be more useful than the others. Partly because it depends on where you guys go and how you decide to go about things and partly because I haven't entirely decided what I really want to throw at you (monster wise and game mechanic wise).