There are 5 ranks in total in the guild, each one represented by a colored plate.
---White < Blue < Red < Gold < Black---
White is the lowest rank and Black is the highest. They are simply referred to as White Plate all the way to Black Plate adventurers respectively.
---Black Plate - 'Spirit' Tier is required to get this rank. Their jobs are usually taken place in extremely dangerous places, sometimes even in the Forbidden Zones.
---Gold Plate - veterans (9th Mortal realm)
---Red Plate - veterans (7th-8th Mortal realm)
---Blue Plate - given to somewhat experienced adventurers (4th-6th Mortal realm)
---White Plate - given to new adventurers (1st-3rd Mortal realm)
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**Black Plates are further divided into 6 ranks; 1 Star per ranks**
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In order to get a new plate, one must first reach the minimum strength requirement.
After that, one must accrue 'Guild Points' to certain levels.
Once both requirement are met, one can take a test for new ranks.
---Guild Points are earned by 'Job Completion', number of points depends on the job---
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It is unknown whether there are any 'Divine' Tier experts in the adventurer's guild. Most of them would be backbone of any major influence and wouldn't be bored enough to be one anyways....