Requirements:
Must have completed Merlins Crystal
Must defeat a lvl-126 Black Knight Titan

Items Needed: Excalibur, some good armor and a weapon and possibly one or two prayer restore potions if you have level 43 Prayer (which is strongly recommended); one or two cure poison potions would help. Also you must have either level 45 Magic, 2 Law runes and 10 Air runes or 60 gp for the boat. The first option saves a lot time. You also need either 2 Amulet of Glory charges or another 60 gp (120 gp total).

Quest Points Reward: 2

Reward: 15300 Defence experience and 11000 Prayer experience. Possibly more or less depending on your Prayer level.