Mithril Bow bow_mithril

What it is for

A Bow-type weapon. Requires level 38 to equip.

Adds 405 physical attack. Changes attack speed by +4%. Has 3 card slot(s).

Sells to an NPC for about 27,500 gold. Weighs 78 of your carry capacity — and weight is what stops drops once the bag fills up.

The best source is Experiment, at 0.12% per kill. Another 1 monsters also drop it. You can farm it at Forgotten Lab.