Take note this is just a placebo lucky effect. There is no trick to get a five star for free or without spending money or saving primogems for months. Just wait for her to be featured on a banner to have a high chance to get her and save enough primogems. If you still can't get her then blame your luck or the gacha rates. This is a gacha game after all.
Or you could just keep playing and keep on pulling for 5 star characters you want and just get Diona randomly.
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