Capital Letters Are Magic: They are indeed: prominent local examples include the Flame and its opposite, the Darkness, in their theological senses.
This, though, is Translation Convention for the Eldraeic augmentative affix, in a language that somehow doesn’t have an augmentative affix. It means “qualitatively, not quantitatively, more so”; i.e., more like that which it is attached to than it itself is. Used to create certain words through poetic metaphor – such as lin-runér (“sovereign”) from runér (“noble”), or lin-aman (“deity”) from aman (“dragon”). Not that you could have capital letters in the original, anyway: Eldraeic alphabets have no letter case. Proper nouns are indicated by such things as color changes or cartouches.