|Tier 20+ ranged weapon|
720 × Impious ashes (2,560,320)
18 × Water talisman (77,886)
36 × Staff (38,484)
72 × Blood rune (40,320)
72 × Law rune (26,856)
144 × Fire rune (15,408)
144 × Nature rune (43,200)
The profit rate assumes 720 kills per hour. Your actual profit may be higher or lower depending on your speed.
Six level 18 spellwisps are found northwest of Wizard's Tower. While they are weak to Ranged, other combat skills could also kill them with ease due to their low health. They drop various items such as impious ashes (which is a 100% drop), Water talisman and a variety of runes.
In order to obtain a rate of 720 kills per hour, it's recommended to kill the wisps quickly in a clock-wise or counter clock-wise fashion. When you finish killing one wave, you have around 30 seconds to loot the items with Area loot and prepare for the next wave by the next spawn location. Once your inventory is almost full (less than 10 spaces left) you should kill one wave and then, instead of looting the items, deposit your current items by talking to Wizard Myrtle. It is possible to accomplish even more than 720 kills per hour by using strategies such as World hopping.
For lower levelled players, you can use the Legacy Combat Mode in order to kill the Spellwisps faster, possibly even one-hitting them. This, however, prevents you from using useful movement abilities such as Surge.