Ghasts rot food in your inventory without the Silver sickle(b), Ivandis flail or Druid pouch, so be careful in Mort Myre Swamp if unprepared. Requires Silver sickle(b)/Ivandis flail and Druid pouch to attack. Awards 30 prayer exp upon being slain. Untransformed Ghasts will be transformed as long as you have at least one charge in your Druid pouch in your inventory. Each Ghast takes up one charge from your Druid pouch.
In order to fill a Druid pouch you must operate the Silver sickle (b) or Ivandis flail around a rotting branch or rotting log. Fungi can be harvested from logs and cuttings can be retrieved from branches. Using this spell drains your prayer level so be careful in Mort Myre Swamp.