Enerael
We Shall Wake to Sanity
Armor is also useful against daemons, Warding in particular. And it costs half as much or less then then a third weapon rune.Of the forces which have a high likelyhood of actually killing our heroes, which is the Lifeguard's job to stop, Daemons take the top. What is useful vs Daemons? Banishment, Damage and Piercing. Also I have the impression that Banishment have a 'Fuck Chaos' discount rate on them.
Equipping all of our Helguard Battalion Champions and Veteran Battle Psykers with banishment runes is also pretty damn useful.