A small number of individuals across each country owned such beings, they were differentiated by rank, F rank the lowest to the highest of S rank, ones rank determined everything when one was a hunter, those with a higher rank were an extension of ones military power and held the power to eradication a city within a flick of a finger.
Once one has been awakened, a term to describe ones transformation, they would be administered a rank typically D or above as an F rank was typically a civilian acting as a Porter, one could improve ones rank by participating in raids and growing stronger, the difficulty of a dungeon was also split into the F to S categories.
gates of each category would need a number of similar rank or large number of the rank previous, and after a seven day period the contents of the gate would be unleashed.
thankfully for the people of the world gates of a higher stature of rank were rarer compared to lower rankings of gates , to the point where a S rank gate was of such improbability of near impossibility.
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To be an awakened was a dream for many as the pay was other worldly and the benefits were incalculable, hunters or the awakened outshone celebrities in status and carried more wealth than large corporations.
hunters were hired under the guise of a guild either run by governments or funded by private entities, for within a gate lied an insatiable medium of power that had numerous uses such as healing properties, generation of electricity and being a strong construction material.
This sprouted a multi trillion dollar economy, naturally higher ranked gates contained more of these and at a higher quality, thus they needed higher ranking hunters.