All that's been posted about Waterfiends is correct. For Lobsters, ice burst is the best. From 82, you'll need: 2,573 Granite Lobsters 3,026 Swamp Titans So about 5600 crimsons. It's about 266 crimsons per 1k bursts. So if you don't use any greens or golds, it'll take you 21k bursts to get the charms. With other colors, I'd guess at around 18k bursts.