On materia gems:
Colors
Despite dungeons being a recent phenomenon, the most common loot inside them has been researched completely. That loot is materia gems.
Materis gems can be used to cast spells, enhance attacks and even boost the integrity of items.
MAteris gems are hardened energy found within Dungeons. No matter the dungeon rarity, the three main colors of gems are equally abundant. Though the gems found in a higher rarity dungeon hold more valuable and hold more energy.
The three basic gems are:
Red Gems: these gems are used to transform spells from one affinity to another. The red gems do this by converting one type of energy to another or transmuting matter from one state to another. For example, a mage who knows fireball[fire/heat] can use energy from red gems to cast a snowball[ice/frost/cold.] Often called the "morph" gems.
Green Gems: mostly used to enhance a hunters body. These can be used to bulk muscles, enlarge a hunter or enhance their speed. Called the "enhance" gems.
Blue gems: the most favored gem. After embedding these gems into an item, like a sword, a lance, a staff or a bow, the blue gem makes that item more dense. Any imperfections in an item's integrity is amplified as well as the rest of the item's matter. Commonly called the "boost" gems.
THer are other colors of gems with their own abilities, but they are rarer. It is rumored that legendary dungeons house gems never seen before, but alas those are just rumors.
Or so the world thinks.