Vanguard helm

The Vanguard helm is part of the Vanguard armour set. This helm requires 85 Strength, Ranged, and Defence to wear. It may be received after winning a game of castle wars - an interface will appear from which one of the three Hybrid armour helms can be chosen. The chance of receiving the helm is increased if more games are won. It can also be bought from Stanley Limelight for 700 thaler. The helm normally gives no bonuses and is cosmetic, but in Castle Wars, Soul Wars, Fist of Guthix and TzHaar Fight Pit, it does. The entire set gives a 15% damage bonus while playing those minigames, but it does not stack with the Castle Wars armour sets. Since an update on the 9th of April 2013, you are now able to take Vanguard helms into Castle Wars.

Trivia
I found a vanguard helm. While playing Castle Wars, I found a vanguard helm.
 * Upon obtaining a Vanguard helm, the Adventurer's Log reads: