The party, at the whim of an old friend’s brother’s request went to defeat some drakes that killed his adventuring group. He told stories that these drakes when slain oozed residuum. He led them to a cave in the Moon Scar after running like hell and wishing them well. In the cave they found the mutated drakes, slain them, but no residuum. Then giant ants came out of the ceiling (like matrix 3 style) by the hundreds. The wizard noticed a purple shard in the cavern wall and began a ritual to extract it and once it was free was able to aim it’s rays at the holes in the ceiling and plug the holes. Once that was over with the drakes grew pustules and the residuum finally came purring out.