As a 41BST on my way back from doing AF Axe quest I decided to see what the Kraken was up to. He was there and checked DC so I Charmed 2hr'd and then went to town with him. He seriously PWNed everything around the island including all the leeches that drop The Carbunkle Ruby for Summoner flag quest. Basically what I'm getting at is:
If you want an easy Ruby so you can become a summoner, PT up with a 40+BST, declare Marshal Law on the Leeches, let the BST have his fun while you tag along, thank the BST when he's done cleansing the island, and then roll out.
It's that simple.