Ghast

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 Cast Bloom ability of the blessed silver sickle (uses some prayer points each time cast) 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 with at least three items, 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
Although not difficult, it is considered by some to be rather tedious to summon Ghasts for combat training. They do drop lots of herbs, much more so than Hobgoblins. The material drops are rather petty. 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 Altar of Nature / Grotto from the Nature Spirit quest. This allows you to keep refreshing your Prayer Points without using vaulable Prayer Potions. The Silver Sickle does not have to actually eqipped 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 occasionaly 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.

Drops

 * Coins 1-125
 * Herbs
 * Bronze kiteshield
 * Iron dagger
 * Iron mace
 * Runes (Fire, Chaos, Cosmic, Body, Air)
 * Eye of newt
 * Fishing bait (common)
 * Tin ore
 * Tinderbox
 * Nature talisman
 * Uncut gems
 * Half keys
 * Shield Left Half