Re: DH: Discussion
Sorry, I was incorrect, it was Shas'la to Shas'ui. Shas'el is actually a Commander Rank, second only to Shas'O.
Usually, to ascend a rank in the Fire Caste, you must pass a trial by fire. This is either surviving a key event or performing a specialist task. If you die, you die. If you survive, you are promoted. If you fail the task, you must wait till another trial by fire, although failing is actually really hard, compared to surviving.
Each Trial by Fire is every three years. So to reach a Shas'el rank, you must have served (and survived) for nine years, including three major tasks. Thankfuly, when you hit Shas'ui, it does become slightly easier as you get a Crisis Battlesuit for your troubles.