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. Building the Fire of Dehumidification in the area stops these attacks (requires the completion of Making Friends with My Arm).
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, stems, or 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.
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.
This monster rolls the gem drop table.
|Uncut sapphire||1||Rare[d 1]||532||15|
|Uncut emerald||1||Rare[d 1]||708||30|
|Uncut ruby||1||Very rare[d 1]||1,406||60|
|Nature talisman||1||Very rare[d 1]||707||2|
|Uncut diamond||1||Very rare[d 1]||3,002||120|
|Loop half of key||1||Very rare[d 1]||10,342||60|
|Tooth half of key||1||Very rare[d 1]||10,206||60|
|Rune javelin||5||Very rare[d 1]||855||1,200|
|Rune spear||1||Very rare[d 1][d 2]||12,016||12,480|
|Shield left half||1||Very rare[d 1][d 2]||65,793||66,000|
|Dragon spear||1||Very rare[d 1][d 2]||38,093||37,440|
|5 March 2013
|The food-rotting special attack of ghasts has been adjusted slightly to fix a bug.