Gnoeals

The first appearance of the Gnoeals is during the Glorious Memories quest, in the Trollweiss Dungeon. They are responsible for turning Nial into a yeti and supposedly turn all adventurers they meet into yetis with a green goo of some sort. The speed at which they transform is relative to the exposure. Nial was hit by the brunt of the attack and thus transformed immediately while Vargas was only hit by a small amount and so was able to stave off a full transformation for many years.

Apart from their habitat and their ability to corrupt adventurers and turn them into yetis, their origin is unknown.

They attack with magic and are surrounded by yetis. It is suggested that the player use a good magic defence boosting armour, such as dragonhide or Karil's equipment. Only the level 84 Gnoeals are aggressive, so staying away from them is an effective tactic, as their magic attacks are very accurate. Weaker players may also choose to use melee protecting prayers if they are attacked by several yetis at once, but this is not advised as the Gnoeals can hit harder than the yetis. Occasionally the yetis and the Gnoeals attack each other, similar to the inhabitants of the God Wars Dungeon. Gnoeals have a fairly decent drop rate for level 2 Clue scrolls, and are advised for higher-levelled players in search of level 2 clues.

Location
Trollweiss Dungeon

Runes

 * 12-13 Lava runes (uncommon)
 * 2-3 Nature runes (rare)
 * 1-4 Death runes (common)
 * Water runes (very common)
 * Blood runes (common)
 * Chaos runes (common)

Charms
Please add your charm drop rates to the next template: 

Consumables

 * Swordfish (common)
 * Chilli potato (common)
 * Wild pie half (uncommon)
 * Bass (common)
 * Super defence potion (2-dose; common)
 * Super attack potion (2-dose; common)
 * Super restore potion (1 dose; rare)
 * Prayer potion (1 dose; rare)

Weapons and armour

 * Mithril warhammer (rare)
 * Adamant med helm (rare)
 * Steel thrownaxe (up to 18, uncommon)

Herbs
All herbs are rare drops unless otherwise indicated.
 * Grimy guam
 * Grimy marrentill
 * Grimy tarromin
 * Grimy harralander
 * Grimy ranarr (very rare)
 * Grimy irit
 * Grimy avantoe (very rare)
 * Grimy kwuarm
 * Grimy cadantine (very rare)
 * Grimy lantadyme (very rare)
 * Grimy dwarf weed (very rare)

Seeds
All seeds are rare drops unless otherwise indicated.
 * Guam seed
 * Marrentill seed
 * Tarromin seed
 * Harralander seed
 * Ranarr seed (very rare)
 * Toadflax seed
 * Spirit weed seed
 * Irit seed
 * Avantoe seed
 * Kwuarm seed (very rare)
 * Snapdragon seed (very rare)
 * Cadantine seed (very rare)
 * Lantadyme seed (very rare)
 * Dwarf weed seed (very rare)
 * Torstol seed (very rare)

Other

 * Nothing (rare)
 * Half of a key (very rare)
 * Uncut sapphire (uncommon)
 * Uncut emerald (rare)
 * Uncut ruby (very rare)
 * Uncut diamond (very rare)
 * Clue scroll (level 2)
 * Silver ore (common)
 * Silver bar (common)
 * Gold ore (common)
 * Gold bar (very common)
 * Starved ancient effigy (very rare)

Trivia

 * The goo attack used on the player does not turn them into a yeti, but will get the occasional quotes in the chatbox like "You feel your hands getting bigger" suggesting a would-be transformation.
 * Monster Examine states that the max hits of level 84 and 93 Gnoeals are 94 and 114 life points, respectively. However, the actual max hit for both levels is about 120. This might not be a glitch, though, as Monster Examine typically gives the maximum melee hit.