Damis

Damis is one of the four guardians of the Diamonds of Azzandra, fought only when doing the Desert Treasure quest. He has two forms, the first being rather easy and level 103, the second being very tough indeed.

Locations
West of the Fishing Guild, down a ladder which requires the Ring of Visibility to see. When approaching Damis's location, the player will be told that they hear a voice from the walls telling them to turn back.

Strengths and weaknesses
In his second form, Damis drains prayer very fast, but not as fast as many people say it is. The best strategy, if you have a spare 200k or so, is merely to bring a few prayer potions (also some sharks to heal any damage dealth if you accientally run out of prayer) and mage him up close using earth wave/blast. Do NOT use melee, as he is incredibly strong against it, and 71 attack and a whip barely hits at all. It is possible, but is much more expensive due to the prayer potions used. An extremely good way to kill him is to use magic. Make a level 80 giant skeleton block Damis from attacking you. Turn on protect from melee, and mage him. Damis can not hit you, meaning he cannot drain prayer.

Drops
Shadow Diamond