APART from waterfiends.
Waterfiends.
I kid;
-Bursting/Barragin Rock Lobs
-Nech's (80+ Slay)
-Abby Demons (85+ Slay)
Hmmm, I guess I'll try and get some money for it. How would I do with it with 84 att. 87 str, 76 def and 75 prayerWhy bother asking about a free bot, seriously....Ugh
I guess any autofighter will do, just make sure you add all types of charms (all item codes for charms) to your loot list. Shadow Warriors, Greaters, Nechs, Abbys, there are a ton of things you can kill that drop a lot of crims. Too many to name.
If you were to bot anything for charms, I would strongly advise getting ArteWaterfiends though (yes, it is a PAID bot, but I have seen some fucking wonderful proggies).
Free bots are, well....You get what you pay for.
As much as you may hate to hear it, Waterfiends is the best mate.

