Casting egg spawn
|Spirit spider pouch|
Egg Spawn scroll
Summoning potion (4)
|Inputs (686,750)||Outputs (1,317,888)|
520 × Egg Spawn scroll (36,400)
4 × Spirit spider pouch (2,080)
18 × Summoning potion (4) (648,270)
936 × Red spiders' eggs (1,317,888)
A great place to do this is Edgeville as it has a bank close to an obelisk on the bridge. Buy around 4 Spirit spider pouches if you're going for an hour and around 520 Egg Spawn scrolls. Use the scroll, which will produce on average 1.8 eggs per scroll. Pick up the eggs and repeat until your inventory is full, then bank them and repeat. When you run low on special move points, drink one of your summoning potions. When your spirit spider has expired, withdraw a pouch from the bank, summon it and repeat the process.
Without the use of a Summoning potion one is able to cast approximately 82 scrolls within the 15 minute time frame of each spider. With summoning potions it is possible to cast more scrolls, and each summoning potion costs from 4856 coins (one dose) and 36015 coins (four doses), and restores 15 special move points per dose (60 points per potion), allowing the user to cast from 2.5 to 10 extra scrolls. Using summoning potions (4) one can make a profit of -2,667.75 per dose.