It was made by combining a blue charm with 125 spirit shards and an Iron bar. This required 46 Summoning and gave no experience. The unfinished pouch could then be infused at a summoning obelisk to make the Iron minotaur pouch, giving 404.8 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 404.8 summoning experience each.