Okay, as requested, I am posting a quick guide on farming Bleached Shells, which you can get from the sand Wurms.
It requires a 55hp build, if you have no idea what that is or how it works, I suggest you read my guide first.
The build I found that worked best in this area was Monk/Ranger, with
Protective Spirit, Healing Breeze, Blessed Signet, Shield of Judgement (E), Serpent's Quickness, Mending, Balthazar's Spirit, Blessed Aura.
With Serpent's Quickness and the attribute points I will provide, you are going to be able to cast your second Shield of Judgement before the first one is over.
Of course you can use another build if you want to, but this one will take 1:25-1:30 per wurm group (usually one, two if you're lucky)
Attributes:
Healing Prayers: 6 +3
Smiting Prayers: 12 +4
Protection Prayers: 7 +3
Divine Favor: 9 +3
Wilderness Survival: 3
Just look at the screenshots (attached below.. btw, I found two bleached shells that run!).. Sorry for cheap, fast guide, I'm kinda tired of typing after the guide I wrote two days ago :P
Anyhow, using this build/run, you can make around 5-6 Bleached Shells per hour, as each run takes about 5 to 8 mins. You can choose to kill or ignore the enchanted swords/bows guarding the teleporter, it's up to you. Good luck, have fun!
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EDIT: BUILD CHANGE
Area of Effect spells have no effect on wurms, therefore feel free to use Balthazar's Aura and/or Symbol of Wrath.
My new build:
Protective Spirit, Blessed Signet, Shield of Judgement {E}, Balthazar's Aura, Symbol of Wrath, Mending, Balthazar's Spirit, Blessed Aura
Tip : A 20% longer enchantments weapon really helps here!
Attribute Points:
Healing Prayers: 6 +3 =9
Smiting Prayers: 12 +4 =16
Protection Prayers: 6 +3 =9
Divine Favor: 10 +3 =13
That's right, no Healing Breeze. It is not needed for this build! I like to kill the first four enchanteds bows/swords/hammers with Shield of Judgement, add a Symbol of Wrath if some manage to live. With only three pips of regeneration, your health might go down a little, just re-cast Protective Spirit for the divine favor bonus.
Follow the pattern from the screenshots, once you get a worm or too, you'll want to fill your energy with Blessed Signet before using Shield of Judgement and Balthazar's Aura, followed by Symbol of Wrath. One wave of this tri-nuking combo should be enough to dispose of every wurm attacking you.
