This item is brutal against him. It makes your ult nonexistant and also lowers sunfire cape damage, which many Garen players get. Could Garen's ult be made true damage? I don't think it would be too strong. Whenever I face a Garen that builds tanky and I'm on an ad champ, I build hexdrinker. It's so broken vs him and it makes it almost impossible to lose if you're not bad.