Waterfiend

Waterfiends are found in the Ancient Caverns, which can be accessed by completing Barbarian Training. Whilst being the least harmful monster in the cavern, they attack with both magic and ranged attacks, which both hit up to 11. Waterfiends are also found in the Chaos Tunnels. Waterfiends have a very high charm drop rate. They are immune to poison, have strong resistance to slashing and piercing attacks, but are weak to crush attacks. Waterfiends are the elemental cousin of the Pyrefiend and the Icefiend.

Waterfiends are one of the best monsters to kill to train Summoning, as they drop crimson charms roughly 90% of the time and rarely drop no charms.

It is advised to wear armour with very high magic defence (such as Karil's or Black dragonhide) and use the Protect from Missiles   or Protect from Magic prayer. Good weapons of choice would be ones that have the crush attack style along with a prayer bonus, such as a Godsword, Zamorakian spear, Saradomin sword, Barrelchest Anchor, Verac's flail or others. Another good tip is to take a tinderbox and logs since they drop raw lobsters and sharks, which could be cooked and eaten. Additionally, taking a Bunyip can increase the time players can stay there with both its innate healing ability as well as its special move allowing players to regain hitpoints from raw fish.

Waterfiends usually drop 1 water rune, 1 charm, and 1 other item (2 grimy herbs as the other item). Sometimes the other item is 90 water runes. This means if you examine the drop and see only a charm and water rune, the odds are good you have received a charm and 91 water runes. If you see a charm, a water rune, and something else (like a shark), the water rune is 1 and not 91.

Note: Waterfiends are resistant to magic, including fire spells.

Waterfiends had an unannounced graphical update on the 5th June 2008 - with this some of their drops changed. Then, later that day, a system update after Smoking Kills was updated to remove the drop change, only to be changed once again to fix some bugs and change some of the drops that were mentioned on the forums.

Locations
Waterfiends may be found in:


 * The Ancient Caverns
 * Chaos Tunnels

Drops
 Always 
 * 1 Water rune

 Runes 
 * 9 Death runes
 * 4 Blood runes
 * 90 Water runes (in addition to the one always dropped)
 * 3 Mud runes
 * 4 Steam runes
 * 3 Mist runes

 Seeds 
 * 1-4 Watermelon seeds
 * Strawberry seed
 * Spiritweed seed
 * Toadflax seed
 * Ranarr seed
 * Snapdragon seed
 * Dwarf weed seed

 Weapons and Armour 
 * Rune medium helmet
 * 5 Rune javelins
 * Adamant chainbody
 * Mithril warhammer
 * Mithril full helmet
 * 90 Mithril arrows
 * 15 Sapphire bolts
 * Blue d'hide vamb
 * Water battlestaff
 * Staff of Water

 Other drops 
 * 195-653 Coins
 * 5, 7, 9, 10 Water orb (noted)
 * Water talisman
 * 5-8 Vials of water (noted)
 * Half of a key
 * Level 3 Clue scroll
 * Crimson charm (Very frequent)
 * Green charm
 * Gold charm
 * Blue charm
 * Nature talisman
 * 1-3 Mithril ore (noted)
 * 2 Mithril bars
 * 5-10 Raw lobsters
 * 3, 4, 6 Raw sharks
 * Shark
 * 2 Grimy herbs
 * 20 Snape grass (noted)
 * 25 Seaweed (noted)
 * 1 Uncut sapphire
 * 2, 4 Uncut sapphire (noted)
 * Oyster
 * 1 Grimy Ranarr