Mithril Helm helm_mithril

What it is for

Armor piece for the Head slot. Requires level 38 to equip.

Adds 12 defense. Has 2 card slot(s).

Sells to an NPC for about 21,400 gold. Weighs 38 of your carry capacity — and weight is what stops drops once the bag fills up.

The best source is Experiment, at 0.20% per kill. You can farm it at Forgotten Lab.