If Lan is able to beat his current situation back an manages to not die or go brain dead during the procedure he will be undergoing soon, I see his life ending in battle. Likely he will die protecting someone else, but I think even as the life finally leaves him he will feel at ease knowing that unto the end, he did what he could for Eorzea.
Peace is not my profession, it is yours. War is my profession. Should you fail at your job, I will not fail at mine.
Lan Darklyn's Wiki
Lan Darklyn's Wiki