I think we need to rule how our group want to handle Wards like the usual circle magic and the Aegis.
When I played the last time I think the general concense was that Aegis and the circle wards have to penetrate and so it is better to use lower level versions of them.
But there diverent "house" rules around that go down till the point where both have not to penetrate.
For the circle magic I personal would suggest the broad Vim based wards against demon, fearie, divine or magic might creatures need to penetrate and the more limited versions of the other forms not to give reason to have them.
Although for broad circle wards that go over all 4 type of might like against animal or ghost I think we need them to penetrate also.
Aegis should at last not need to penetrate to keep creatures of might outside.