It was made by combining a blue charm with 195 spirit shards and an Obsidian charm. This required 73 Summoning and gave no experience. The unfinished pouch could then be infused at a summoning obelisk to make the Obsidian golem pouch, giving 642.4 Summoning experience. Any leftover uncharged pouches may still be converted in experience. Clicking one in your inventory prompts a warning message saying: "this item no longer has use. Convert it and claim the xp contained within?". Choosing 'Yes' will convert all pouches in your inventory into 642.4 summoning experience each.