Crafting lava runes can be incredibly profitable, if using the Magic Imbue spell to negate the need for expensive talismans. At 75 Runecrafting and 93 Summoning, for the giant pouch and abyssal titan familiar, 71 essences can be processed per trip. Using the balloon route from Castle Wars to the Sawmill, approximately 85 trips can be made per hour, for around 6000 lava runes made per hour if you can complete a trip in 42 seconds. Additional profit can be made by using the massive pouch, if they have already been obtained from prior training in the Runespan.