|443,100 per hour|
162 x Fiyr remains (443,070)
Fiyr shades can be found at the end of the Shade Catacombs underneath Mort'ton. Accessing them requires a silver shade key, which is most easily obtained by burning fiyr remains on the pyres to the southern part of Mort'ton (requiring 80 Firemaking and magic pyre logs), or burning asyn remains (requiring 65 Firemaking and at least yew pyre logs). Use that key to enter the catacombs, going through the bronze, steel and silver doors.
There are four fiyr shades outside the rooms, and a few more inside them. Taking down the shades should not be difficult as they have low Defence and will hardly hit you at all. Wait for them to spawn, and repeat. Once you've got 27 fiyr remains, teleport to Burgh de Rott using Morytania legs 3, bank, and then run north to Mort'ton and back through the catacombs to kill more shades. One run, including banking, takes ten minutes, for a profit of 73,845.
After you've gathered enough remains, sell them on the Grand Exchange. They may take a while as fiyr remains are not particularly popular, but they should sell eventually.
It is strongly recommended to check the live prices on the Grand Exchange before making large investments in any method.
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