Do you have any thoughts on description and background?
Hmm...
I'm inclined to keep it simple and use something like this for the description.
A formidable looking warrior wearing elaborate armor and sumptuous robes, both faded and worn by age.
I did wonder about making it more elaborate by giving him all-concealing sinister garments, but there's nothing in the original description to support the addition.
A formidable looking warrior who's every feature is hidden behind elaborate armor and robes, once sumptuous but now faded and worn by age. The warrior's helm is fitted with a grotesquely grimacing mask that entirely covers the face. You can feel the warrior gazing at you with terrible intensity despite there being no eyes visible behind the black holes of the mask.
For the background, again, we don't need that much. How about this:
The General is one of the Seven Swords, a group of seven weapon masters who were transformed into unique undead by an ancient curse that binds them to a castle they once guarded in life. If one of the Seven Swords is destroyed, the curse causes them to reform the following night and continue to haunt the castle.
In life, the General was a proud and vicious man famous for bearing the
crimson katana, a magical sword as bloodthirsty as he was. In death he remains unrepentant of his atrocious deeds and intends to add to them by slaying all intruders to the castle. The General spends its time meditating and brooding over lost battles when waiting for living victims to kill.
In Kara-Tur
The Seven Swords were the leading members of the Ito clan and lived in Ito-Jo castle. The malign influence of a krakentoa led to their rule becoming tyrannical and eventually brought down a dreadful curse upon the Swords and the entire castle, turning it into a haunted place of the damned. The Seven Swords of Ito-Jo cannot be destroyed simply by destroying their sword charms. The only way to permanently lay them to rest is to slay the krakentoa responsible for the curse.
The General was once Ito Tadahiro, the widowed father of Ito Kiku (the young woman who became the Veiled Maidens). While amazing with a sword, his arrogance and lack of tactical acumen made him a poor war leader. General Ito suffered such catastrophic defeats he lost all rank and position, forcing him into the disgraceful life of a wandering sell-sword. Eventually fate – or the krakentoa's curse – drew him back home, where he became one of the undead that haunts Ito-Jo castle to this day.