This trophy is obtained for completion of the eighth main story mission ('Mage's Tower') and is thus an unmissable part of the progression through the game.
**Minor Mission Spoilers Follow**
This mission starts off with trying to identify the evil tablet that you got from the previous mission. First stop is Lucain who translates the tablet but has no idea what it really means. Next you want to bump into the withered old man on the way out of the temple in town. He will properly explain the tablet for you (as well as destoying it) and direct you back to Lucain. After visiting Lucain again you will be directed to the 'Mage's Tower' to go take out some evil wizards who are trying to use black runes to open a gate to another dimension and summon a great evil. Mage's Tower is a long and fairly difficult area. You start by climbing up the tower until you reach a chained fairy.
Now you descend down an elevator (hit the lever at the bottom of the screen) into some sort of underworld type environment with a bunch of demons. You reach an impassable lava lake and you need to use runeword 'SFC' (Solomon's Flying Carpet) to proceed. On the carpet you will have two lanes that you can move between and you have to dodge fire that is attacking from behind you (learn to identify the graphical tells for the two types of attacks). Eventually you reach a cliff that you need to jump off of in order to face the Warlock boss. Warlock has a lot of strong magic attacks, the only real advice I have is to hit him as hard as you can as fast as you can. Your AI companions will probably die at least once or twice in this fight. The level is over once you defeat the Warlock and you will receive the Rune Stones and this trophy inside the Dragon Haven Inn while you are going through your spoils.