The Adamant two-handed sword is a tier above the mithril two-handed sword and a tier below the rune two-handed sword. Like all Adamant weapons, it requires 40 Attack to wield. Being a two-handed weapon, a shield cannot be equipped with it. It is also considerably cheaper than its rune counterpart so lower levels may find it more convenient regarding the cost.
The Adamant 2h sword was once the most powerful sword in the game, that is, until Runite was introduced to RuneScape and the Rune 2h sword became most powerful, being beaten again, by the Dragon 2h sword.
Like all other adamant weapons, the Adamant 2h sword used to require 30 Attack to wield; this was changed to 40 Attack with the Evolution of Combat.