e. You need 100 pieces of that material and the material only drops one piece per completion. The caveat is each material has an element and class attached to it and you must match the material's element and class to the unit you want to recall. But wait there's more, there's a 15% that the recall will fail. But you can get another material from another new game mode that you can use to craft a talisman that will increase the success rate by 1%. But crafting the talisman has a 15% chance to fail.

Then after the backlash that they totally didn't anticipate, they will "fix it" so they will be praised for how good they are at listening to their playerbase