A very common question about summoning is where are good places to get charms. Well the monster I like to use without having to spend hundreds of thousands on gold is Cockroach Soldiers. They are level 83 and have 96 hitpoints... they also drop crimson charms 36.7% of the time (tested this on 1500 cockroaches) And I usually make around a 200 - 300k profit in the amount of time it takes to get around 35 - 40 charms. They also have low defense and hit very rarely.
