Image by the author using Midjourney.
After intense focus and study, a Bladeservant can have a specialized knowledge of a specific class of bladed weapons. It is a mixture of learned knowledge, and an innate sense developed by the Bladeservant. The bladeservant needs to spend ? time respectfully examining the weapon to understand any special qualities it may possess. Examples include an unusual material (meteor rock, silver), crafted by a known master smith, or used by an ancient race. Lore and history of the blade, if any, are learned as well as any magical or supernatural qualities. This knowledge is gained both through the Bladeservant's years of study of blades, and his uncanny connection with the weapon.