Defeat Ratash in the Throne Room wihout taking any damage.
The magic words for this trophy are STONE ARMOUR. Yeah, that's pretty much all you need, cause you are invincible as long as it's activated. During the fight with Ratash, especially when he calls for normal enemies keep an eye on your activation and hit him hard. That's the reason why you should level up your engery and your Stone Armour first.
Works the same for Invincible trophy, you just have to be a bit more economical with your energy.