God

To be called "god", one must inhabit a level all their own. What it takes to be deified is a matter of debate, and somewhat varied by religion, but there are certainly some criteria that can be established.
The first is being a "Creature of Spirit" or an actual Spirit. While many try to limit it to the Progenitor races, that can't strictly be used as a criteria, as there are some deities not believed to have originated as a Progenitor. An example of this would be Qyxphaarg - a Dwarven Smith revered in the Dumylan traditions as a forge god. Dwarves are not Progenitors and, therefore, not all gods are Progenitors.
Another thing that all gods must be - and the reason the must bear the spark of the cosmos - is that they must have magic power of some kind. This must be something they bear within themselves, as simply using an artifact to cast spells doesn't count for much. This inherently gives creatures from outside of the mortal realm a leg up in some ways, as they are born with the inherent ability to utilize the energy of their home cosmos in order to do magic. However, magic is not all that they must have, it also matters what they do with it. 
In order to be a god, one must possess immense power. The general metric used is that they must check one of three boxes that display their immeasurable strength.

1. They must create a new form of life
2. They must kill or otherwise gravely wound another creature that bears the title of "god"
3. They must create an artifact used killing or grave wounding a creature that bears the title of "god"

If they do one of those things, they may be a contender for godhood.
However, all of those pale in comparison to the single most important criteria: people must worship you. Regardless of any other factor, if you lack supplicants, you are not a god. The Lách Doire faith actually made this a key part of their beliefs; they teach that placing your faith in something or someone grants power. They teach that gods are made by those that worship them and that, should the people stop, the gods will fade away. It's true to a very real extent. A person can call themselves a god, but it means nothing unless people follow them.

Type

Religious, Special

Alternative Naming

Deity