These blessed and pungent ointments can be used to trace sigils of protection onto armour, and are known to repel the Warp-spawned powers of the Daemon and its kin. The Daemonhunter and the unit he is with benefit from a 4+ save against the effects of any and every enemy psychic power used upon them. If this save is passed then the power has no effect.
Unguents of Warding
Source: Codex: Daemon Hunters, p. 19