Second Echelon is the second rank class of four within the Grand Master's Royal Guard in the Dark Brotherhood.
The Second Echelon contains Four (4) GMRG Ranks:
- Sentinel I [GMRG-S1]
- Sentinel II [GMRG-S2]
- Sentinel III [GMRG-S3]
- Sentinel IV [GMRG-S4]
It is followed by the Third Echelon.