Airfiend

Airfiends are the strongest fiends in runescape and can only be found in Radiver's Dungeon (which requires 72 slayer to enter) in the second sector of the dungeon. They can only be assigned as a slayer task by Radiver Jonesta. Airfiends attack with magic attacks, which are very accurate and can cause very high damage, so good armour which can protect against magic attacks is necessary.

Airfiends have a very high charm drop rate, especially for Blue charms (around 50%). For this reason, they are targeted by many players who wish to level up summoning quickly.

Waterfiends have extremely high defence against slashing and piercing attacks. They are weaker against ranged attacks, but even there, their defence is good. Poison has no effect on airfiends as the poison goes right through them.

Recommended Equipment
Inventory:
 * Armour
 * Headgear
 * Full Slayer Helmet > Slayer helmet > Black mask (If it is a slayer task) or Helm of neitiznot (for the Strength and Prayer bonuses) or a Halo (for the Magic Defence) or Archer helm (for the Ranging bonus and Magic Defence) or Void Melee Helm / Void ranger helm depending on using melee or ranged.
 * Body
 * Pernix body > Karil's leathertop > Armadyl chestplate > Elite Void Knight top >Black d'hide body > Void knight top
 * Legs
 * Pernix chaps > Karil's leatherskirt > Armadyl chainskirt > Elite Void Knight robe > Void Knight Robe > Black d'hide chaps
 * Gloves
 * Barrows gloves > Regen bracelet > Combat bracelet
 * Boots
 * Dragon boots > Rune Boots > Rock climbing boots > Infinity boots (for the magic defence)
 * Neck
 * Amulet of fury > Amulet of glory > Amulet of ranging (for magic defence) > God stole (for the prayer bonus)
 * Cape
 * Soul Wars cape or Fire cape > Achievement capes(t) > Ardougne cloak 3 > God cloak
 * Weapons
 * Chaotic crossbow(requires 200000 tokens in Dungeoneering) > Rune crossbow > Dragon crossbow > Dark bow
 * Rings
 * Onyx ring (i) >Dragonstone ring (i) > Diamond ring (i) >Berserker ring (i) > Berserker ring > Explorer's ring 3 > Ring of Charos (i) or Ring of life
 * Summoning
 * Unicorn stallion (with Healing Aura scrolls) > Titan (with Titan's Constitution scrolls) > Geyser titan (high ranged damage)
 * Unicorn stallion (with Healing Aura scrolls) > Titan (with Titan's Constitution scrolls) > Geyser titan (high ranged damage)
 * Enchanted gem, Ring of slaying or enchanted slayer headgear.
 * Prayer potion - At least 4 recommended; optional if using Unicorn stallion.
 * Saradomin Brew / Super restore (optional) Excalibur (e) (also optional especially if you're useing Saradomin Godsword)
 * Extreme attack / Extreme Strength > Super attack / Super strength - Bring at least two of each
 * Holy Wrench - only if bringing prayer potions or super restores (optional)
 * Good food, preferably Sharks or better, is a must if you lack the level required summon any of the suggested familiars, since you can only use one protection prayer at a time.