Ghasts are undead souls of people that starved to death in Mort Myre swamp. When they first appear they are invisible and have no combat level, and try to turn food into useless rotten food; if players have no food they will do damage instead.
Ghasts can only be killed after completion of the Nature Spirit quest. You must have a Druid pouch and blessed silver sickle to kill them. You must use the ability of the blessed silver sickle near some dead logs or bushes to harvest Mort myre fungi, Mort myre stems, or Mort Myre Pears then put those into a druid pouch by filling it. When your druid pouch has been filled, you can use it to make a Ghast visible, or wait until a Ghast attacks you to make it visible. This renders the Ghast vulnerable to attack; killing it rewards the player with 30 Prayer experience.
Ghast hunting notes
Due to the nature of making the Ghasts visible, they are not good for combat training. They do drop lots of herbs, but so do Hobgoblins. The material drops are pretty weak as well. You do, however, gain reasonable Prayer XP as well as Combat XP for killing them.
The best place to hunt them would be just west of the Nature Grotto from the Nature Spirit quest. This allows you to keep refreshing your prayer points without using valuable prayer potions. The silver sickle does not have to actually be equipped to gain its benefits, it just has to be in your inventory. A player can use whichever weapon they choose for combat, not having to use the sickle. Fully charge your prayer points, go west of the Grotto (where the Ghasts are) and cast Bloom with the sickle next to the rotten logs. Try and do it between 2 logs, and you will occasionally get 2 mushrooms to put in the Druid pouch. Do this over and over until you are out of prayer points. Now "use" the filled pouch on the ghostly Ghasts - do not wait for them to attack you. Often they will just float around, or the pouch will activate itself, allowing the solid Ghast to float out over the water where it cannot be attacked. The drops will more often than not fall under the rotten logs, so search the ground carefully after defeating the Ghast.
You can actually fill the druid pouch much faster if you cast bloom near fallen tree branches, their trimmings count for 2 in your druid pouch as opposed to mushrooms only counting for one charge.
Weapons and armour
Item Quantity Rarity GE market price Iron dagger 1 Common 8 Iron mace 1 Common 19 Bronze kiteshield 1 Uncommon 33
Item Quantity Rarity GE market price Grimy guam leaf 1 Common 13 Grimy marrentill 1 Common 12 Grimy tarromin 1 Common 121 Grimy harralander 1 Common 637 Grimy ranarr weed 1 Uncommon 6,585 Grimy irit leaf 1 Uncommon 748 Grimy avantoe 1 Uncommon 1,721 Grimy kwuarm 1 Uncommon 1,154 Grimy cadantine 1 Rare 1,393 Grimy lantadyme 1 Rare 1,209 Grimy dwarf weed 1 Rare 512
Runes and talismans
Item Quantity Rarity GE market price Body rune 1–3 Common 4–12 Air rune 1–3 Common 5–15 Fire rune 7 Uncommon 35 Chaos rune 4 Uncommon 392 Cosmic rune 2 Rare 260
Item Quantity Rarity GE market price Coins 1–125 Common Not sold Fishing bait 7 Common 35 Tin ore 1 Rare 33 Eye of newt 1 Uncommon 4 Tinderbox 1 Uncommon 88
Gem drop table
In addition to the drops above, this monster has access to the gem drop table.
Show/hide gem drop table Item Quantity Rarity GE market price Uncut sapphire 1 Rare 654 Uncut emerald 1 Rare 818 Uncut ruby 1 Rare 1,494 Nature talisman 1 Very rare 705 Uncut diamond 1 Very rare 3,069 Rune javelin 5 Very rare 835 Loop half of key 1 Very rare 13,729 Tooth half of key 1 Very rare 11,794 Rune spear 1 Very rare 11,994 Shield left half 1 Very rare 65,388 Dragon spear 1 Very rare 37,303
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