In my continuing effort to try to justify the existence of the Summoning skill, at least in my own mind, I spent the past several days researching and trying to harvest green charms. Of the four basic charms (gold, crimson, green and blue), green comes in at number three in difficulty to find. As far as my research and experience goes, I have found no end-all-be-all solution to harvesting green charms quickly. But I have seen things that are better options than just hoping for a random drop from any old monster.

Green Dragon in the Wilderness
The talk on Internet forums and fan sites is that Green Dragons tend to drop green charms at a higher rate then other monsters. I will agree that green charms do drop from Green Dragons at a significantly higher rate. But I think Green Dragons are too much a pain in the butt to be an effective and efficient charm harvesting tool. First, they are located in the wild where their location poses a much greater risk to safety. Second, though they are the easiest of Dragons to kill, they still require investments in food and potions. Third, they take too long to kill, and are heavily hunted by other players. Don’t get me wrong, there are many reasons to hunt Green Dragons (for one, their hides turn a nice profit). But as a safe route to train summoning, I personally would leave these monsters alone.

Fighting an Abyssal Guardian
The only creatures that seem to be worthwhile for me to spend my time killing to harvest green charms is the four Abyssal Monsters. These creatures range in combat level from 41 to 124, and are located in the Abyss or ALR plane of the Fairy Ring network. Of the four, the Abyssal Demon is the only slayer creature, and requires level 85 slayer to kill (but it does have some wonderful drops, including the Abyssal Whip.)
I personally stay on the Abyssal Guardians (level 59) because they die fairly easy for my level 89 warrior, they respawn almost instantaneously, and they have some nice drops in addition to charms. But all Abyssal monsters drop charms, and I have found that they tend to drop greens more often then the other colors. Abyssal monsters will also drop Abyssal charms, which are required secondary ingredients for a couple of higher level summoning pouches. Abyssal charms do not stack and I have not yet decided if they are really worth collecting. In addition to charms, Abyssals drop pure essence in both physical and noted forms, talismans (all kinds), binding necklaces (which I ignore because they do not sell well on the Grand Exchange), and rune crafting pouches of all sizes.
The Abyss is accessible once you have performed a small favor for the Zamorak Mage who hangs around the mouth of the River Lum, just north of Edgeville (level 5 wilderness). This is not a dedicated quest (don’t confuse it with the One Small Favor quest). It is just a minor task that needs to be performed so the player can learn the background story. The Abyss can be a very dangerous place, and is multi-combat, so things can get dicey very quickly. I prefer to fight the Abyssal monsters on the ALR plane of the Fairy Ring network, which is much safer. To access the fairy rings you will need to have started a little of the Fairy Tale part II – Cure a Queen quest. The Fairy Ring network provides quick access to the ALR and many locations throughout Runescape, including a nice portal squarely between Edgeville and the Grand Exchange.
As for me, I think fighting Green Dragons is a more fun and interesting way to harvest green charms. Challenging the Abyssal monsters in the ALR can be very dull, and trying to collect charms in the Abyss itself is downright suicidal. In the end, both routes seem to produce simular numbers of green charms in simular time frames. If you want a degree of safety, go with the ALR. If you want something a little more interesting, but more dangerous, go with the Green Dragons.
Abyssal Leech (CL 41,HP 10); Abyssal Guardian (CL 59, HP 50); Abyssal Walker (CL 81, HP 95); Abyssal Demon (CL 124, HP 150); Green Dragons (CL 79, HP 75)