An earth rune obtained in the Runespan is created by siphoning earth esslings, rock fragments (both requiring 9 Runecrafting) and vines (with 17 Runecrafting), requiring one rune essence and giving 14.5, 28.6 and 32.5 experience respectively.
Earth runes are worth 0.2 Runespan points and can be used for earth platforms and vine platforms. They can also be used to chip cosmic esshounds. They will disappear and be converted into points if you leave the Runespan.
Players that try to bank any runes or essence from Runespan receive the message "A magical force prevents you from banking this item."