@JeremyECrawford wondering how alert feat interacts with invisible attacker. Alert mentions hidden but not unseen. Seeking a clarification.
— Oskar581- Josh Hanna (@Oskar581Hanna) June 10, 2016
The 3rd benefit of the Alert feat is imprecisely worded. It's meant to work against creatures you can't see. #DnD https://t.co/xx0mdm1woC
— Jeremy Crawford (@JeremyECrawford) July 6, 2016