Excalibur is a one-handed sword obtained from the quest Merlin's Crystal. It requires 20 Attack to wield and has similar stats to the adamant longsword, except with 6 less strength bonus.
If lost, it can be retrieved from the Lady of the Lake in Taverley for 500 coins.
Excalibur is also used in the quest Holy Grail.
A player performing the Excalibur's special attack, Sanctuary
The Excalibur has a special attack, Sanctuary, which temporarily increases the player's Defence level by 8, consuming 100% of the player's special attack energy. Because of its stats, many low levelled players use Excalibur for combat as it is relatively easy to obtain and is free the first time you get it.