A mystic earth staff is the most powerful earth elemental staff. It requires level 40 Attack and level 40 Magic to wield. It has the autocast option, which can be used for all of the elemental combat spells, and it provides an unlimited amount of earth runes. To create one, take an earth battlestaff and 40,000 coins to Thormac after completing the Scorpion Catcher quest.
Dropping monsters[]
Monster Combat level Quantity Rarity Corporeal Beast 785 1 Common Lizardman shaman 150 1 Uncommon Dust devil 93; 110 1 Rare Choke devil 264 1 Rare Experiment No.2 109 1 Rare (1/128)