This a rough guide, which may need refining over time.
Equipment Required
God Items
You must wear three god items - Armadyl, Zamorak and Saradomin. An armadyl pendant will suffice and can be obtained for free from the Temple of Ikov quest.
Weapons and Armour
Use a rune crossbow with addy bolts, and enchanted diamond bolts for the boss. You want armour that defends well against range, so an obby shield is excellent.

In the above image the three god items are armadyl helm, zammy chaps and sara bracers.
Other items include black dhide body, obby shield, rune crossbow, and a glory (not usable if you are relying on an Armadyl pendant.
Food and Potions
You will need prayer pots and sharks or better, and also bones to peaches tabs, range potions and possibly super defence.
Other Essential Items
You need a mith grapple to get to the Armadyl boss area.
A tele tab is essential as you may need to bail out quickly.
How it’s done
Kill 40 aviansies, go and kill the boss.
You want to kill the aviansies and still have a full inventory of food and pots. Use the two empty slots in your inventory (left by teleporting to Trollheim) for bones. As and when required turn them into peaches. This means that when you get to the boss you will have a full inv.
If you kill the aviansies before the grapple post you will take less damage.
When you’ve got 40 kills, drink a range potion and go and kill the boss and then his pals. Range protection prayer is vital.
Be focused on eating and potting, and be ready to bail out if you have to.
