Blood Knight Tabard



The Blood Knight Tabard is worn by important members of the Blood Knight Order, as well as blood elf paladins (players) who reached the rank of Master by obtaining their Thalassian charger.

This tabard will be converted to a normal Guild Tabard if a blood elf player faction-changes to Alliance. However, if the blood elf only race changes to tauren, they will be able to keep this tabard.

Source
This item is a quest reward from Quest:Weapons of Darkness (blood elf).

Cataclysm
According to Nethaera, with the removal of the quest chains to obtain the paladin mounts, the Blood Knight Tabard will now be part of the level 50 class quests: