The dragonfire ward is a ranged shield requiring a Ranged level of 70 and a Defence level of 75 to equip, as well as having started Dragon Slayer 1.
The ward offers two special effects: it acts like a regular anti-dragon shield in terms of dragonfire protection, and it also protects against the icy breath of Wyverns. The quickest and easiest way to charge an uncharged dragonfire ward is using a vial of powered bottled dragonbreath on it.