Most of the time, they are dropped one at a time, making them slow to collect however, some stronger monsters can drop multiple charms at once. Charms are usually dropped independently from the monster drop list. They are obtained primarily as drops from any of hundreds of different monsters.
Crimson charm - requires 19 Summoning to use. Green charm - requires 18 Summoning to use. This is the only charm available in free-to-play. There are 5 types of charms used to create every type of Summoning pouch : Gold charm - requires 1 Summoning to use.
This article is about training the Summoning skill, and is required for Summoning training.