A death rune obtained in the Runespan is created by siphoning death esswraiths (with 65 Runecrafting), skulls (also 65 Runecrafting), bloody skulls (with 83 Runecrafting) and undead souls (with 95 Runecrafting). Siphoning requires one rune essence and gives 60, 120, and 144 experience respectively.
Death runes are worth 2.5 Runespan points and can be used to cross skeletal platforms, greater missile platforms, flesh platforms and greater conjuration platforms. They will disappear and be converted into points the Runespan is left.
Attempting to bank any rune or essence from Runespan will be prevented by a magical force.