Quote Originally Posted by ArkAurelius View Post
It reads that it affects damage from Auto Attacks, damage and HP restored. Yet rarely do I hear about it, if at all?
It affects healing delivered, not healing received. Determination is only for damage on tanks, and damage isn't a high priority unless you're well above VIT threshold for content. Among the secondary stats, determination is second priority for PLD (parry > determination) and third priority for WAR (parry > skill speed > determination).